Dosimetry Phantoms

Dosimetry Phantoms

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Build-up Caps

Build-up Caps

The total build-up should be calculated using the wall thicknesses and thimble thickness with the appropriate density.  For detailed statistics on the thicknesses available, please open the specification sheet.



Geometric QA Phantom

The ISIS QA-1 Phantom was designed to provide an easy, low-cost approach to the daily, monthly and annual QA tasks for the Physicist and Therapists.  The ISIS QA-1 phantom will aid in verifying the geometric laser position accuracies with multiple laser systems within your department.  The ISIS QA-1 also provides the Physicist and Dosimetrist the ability to verify electron beam density values produced by your CT / CT-Simulator.  Staff members scan the four unique density value inserts, then transfer this image to the RTP system for verification of the electron density values of the Bone, Water, Inhale and Exhale Lung density inserts.  Comparing the individual value for each known density value, the user can quickly verify CT image electron density values for treatment planning image QA.

Additionally, the ISIS QA-1 provides an internal known object insert that is scanned with the CT / CT-Simulator.  With this multiple image slice set you can create a Treatment Plan / Virtual Simulation plan of the known object for size and location verification though your RTP and Virtual Simulation system.  The ISIS QA-1 then goes one step further to use these known geometric phantom positions for verification of the laser positions as verified with the scanned ISIS QA-1 phantom.  This QA process provides a geometric QA of the processed RT Plan for use with IMRT treatment machine lasers and mechanical treatment field setup verifications.  The dose chamber insert will provide the physicists the ability to quickly measure single-point expected dose values without using additional phantom devices.  This removable insert is matched to your existing standard dose chamber (model and manufacturer of chamber must be specified).

The ISIS QA-1 helps standardize the QA program for the installation engineer, maintenance engineer, therapist, dosimetrist and/or physicist.  These QA tasks are accomplished by using a common single QA alignment/ verification tool, thus producing a common geometric theme within the radiation therapy department prior to implementation of an IMRT or standard external beam treatment program.  The continuing review of the geometric accuracy between all department systems is important with using today’s high-quality and technical treatment protocols.

Model DTP-008

Dynamic Thorax 4D QA Phantom

The Model DTP-008 Dynamic Thorax Phantom is designed to investigate and minimize the impact of organ motion and patient positioning errors in radiation therapy.  It is the first commercially-available dynamic QA phantom, developed for image acquisition, treatment planning and dose delivery.

The Dynamic Thorax Phantom is manufactured from materials that mimic tissues within 1% from 50keV to 25MeV.  The phantom accurately represents average human thorax anatomy in shape, proportion and structure.

Tumors of various size, shape and density can be positioned within the lungs and means are provided for placement of TLD and MOSFET detectors directly within the tumor volume.

A computer-controlled actuator applies complex three-dimensional motions to the tumors within the phantom body.  Linear target motion in the superior/inferior direction can be isolated from lateral and anterior/posterior motion in both frequency and amplitude.  Two motions can be synchronized to one another enabling sinusoidal and other complex motions to be achieved with sub-millimeter accuracy and reproducibility.  The system includes 16 pre-set motion profiles.  Upon special request, the phantom body can be modified for cardiac, abdominal, pelvic or head and neck applications.

IMRT Software


Verification Software

Designed to save valuable time and resources, RadCalc®Verification Software is utilized in radiation therapy departments for the determining monitor units and the calculated dose at points of interest for either photon or electron beams.  RadCalc’s monitor units can be used to validate the monitor units determined by the primary radiation therapy planning system or used for treatment.  In addition, RadCalc® allows for the import of the treatment planning data through several different methods while also possessing the capability to export to a department’s Verify and Record system.

RadCalc® is the first and most powerful QA software program FDA 510(k) approved to perform independent monitor unit or point dose verification calculations for both conventional and IMRT treatment planning systems, including Diode and EDW support.  Only RadCalc® offers fully-automated verification by allowing users to import and export directly, reducing hand entry data errors.  Each software package includes setup, installation, training and hardcopy printouts for billing and patient documentation.  Software is compatible with any Windows® operating system.

RadCalc® Program and Available Utilities

RadCalc® BASE PROGRAM:  RadCalc® base software performs independent MU or point dose verification calculations for conventional treatment plans including Electron, Photon, MLC, 3D Off Axis, Diode, and Enhanced Dynamic Wedge support.  Fully-automated calculations for Conventional and IMRT plans are available by purchasing the RTP Import, V & R Export, and IMRT utilities separately.

RTP IMPORT UTILITY:  The Import utility provides the importing of treatment field parameters from a Radiation Therapy Planning system, Verify and Record system, and/or virtual simulation software.  RadCalc® reads the transferred information and then performs the calculation. This utility requires the RadCalc® Base Program.

V & R EXPORT UTILITY:  The V & R Export Utility provides the exporting of treatment field parameters and Monitor Units in a format that is readable by a V & R system and/or TPS.  The client must have RTP: Link, Exchange, or Connect from the appropriate V & R vendor available.  This system also requires the RadCalc®Base Program.

IMRT VALIDATION UTILITY:  The IMRT Utility provides the verification of MU or point dose calculations for IMRT based treatment plans.  The IMRT utility allows you to import from your treatment planning system either static or dynamic MLC leaf sequences.  A modified Clarkson integration algorithm in RadCalc®utilizes the MLC leaf sequences in order to compute the dose or MU.  RadCalc® is capable of handling an MLC with up to 200 leaves.  The MLC leaf patterns are viewable within RadCalc’s MLC Data tab.  This system requires both the RadCalc® Base and RTP Utility Programs.

muCheck & IMRT Check

Verification Software

muCheck Verification Software has been designed to validate monitor unit calculations performed by your TPS.  It is an independently operating Windows®-based program.  muCheck has an extensive list of features that will allow any qualified member of your therapy department to perform calculations quickly and easily.

muCheck features FDA 510(k) market clearance.  It performs calculations for both photon and electron beams and supports Isocentric (SAD) and TSD (SSD) calculations.  Other features include normalization to Isodose line and an extensive online Windows help and glossary.  muCheck possesses comprehensive utilities for management of beam data, including graphical representation of data.  There are multiple ways to enter blocking for irregular fields and it supports any number of treatment machines.  muCheck provides an online worksheet as well as hardcopy output for the patient’s chart.  It also does multiple field, dose point and diode calculations.  Additionally, muCheck provides for all types of correction factors including trays, table attenuation, tissue compensators, off-axis corrections, cone inserts, custom cut-outs, and both physical and enhanced dynamic wedges.

The Utilities module allows the physicist or other qualified persons to modify the beam data that has been initially configured for your system.  Utilities are password protected, table names are easily recognizable and data can be printed and graphed for verification.  The system has great flexibility to accommodate various methods of beam data measurements and calculation preferences.

IMRT Check software was developed to independently verify the dose calculated by the IMRT treatment planning system.  It can be used in addition to film dosimetry and phantom studies as yet another verification process in your Quality Assurance procedures.  Only two input screens are required to verify the dose calculated by your treatment planning system or phantom measurements.  IMRT Check can import directly the MLC file created by your planning system or data can be passed via the DICOM RT import utility if available on your RTP system.  IMRT Check will allow you to optionally average 9 points showing the dose at each of these points.

Static (step and shoot) and dynamic (sliding window) IMRT plans are also supported by IMRT Check.  Transmission due to the rounding of the leaf tips as well as overall leaf transmission can be adjusted for each photon energy.

Software installation on your computer and personal training at your department are optionally available.

Quality Assurance (QA)


CT Phantom & Evaluation Software

A test phantom and software for QA/QC of CBCT, CT and Dental 3D imaging systems.

665 Series

Acrylic Calibration Check Phantoms

These economical calibration check phantoms are solid 15cm cubes, constructed of laminated acrylic.  Photon calibration checks can be conveniently and quickly performed at 5cm depth through the top surface.  The phantom is simply inverted for photon measurements at 10cm utilizing same chamber cavity.  The 665-600 and 665-700 series calibration check phantoms provide additional electron measurement at 1cm and 1.5cm depth, respectively, with an additional chamber cavity on one side.  Field markings of 10cm² are provided on all beam entrance surfaces.

Model WP-5230

Water-Filled Calibration Phantom

The CNMC Model WP-5230 is an economical, convenient, easily transported acrylic water-filled calibration check phantom.  It is compact, measuring only 20 x 20 x 10cm and weighing just under 3 lbs when empty.

The entrance window is engraved with 10cm field and central axis markings.  An acrylic transverse-mounted sleeve supports any Farmer-type ion chamber, including the Capintec PR-06C.  The ion chamber’s reference point is automatically aligned with the field central axis engraved on the entrance window.  The chamber depth is fixed at water-equivalent 5cm. As such, the WP-5230 water phantom provides good characteristics for routine checks of the beam output from 2 to 10MV photons.

A screw plug can be removed for easy filling of the phantom with water; boiled, distilled water is preferred.  The plug is designed so the phantom will be fully water-tight at any angle.  The phantom is fitted with two expansion vessels to cover a temperature range of 5 – 35°C, extending the practical range of both temperature and pressure.

Model SWP-1427

Stereotactic Calibration Phantom

The CNMC Model SWP-1427 water-filled stereotactic calibration phantom offers an economical means of achieving the desired depth when calibrating a stereotactic beam with a N23342 plane-parallel ion chamber.  The phantom consists of a 13cm diameter acrylic cylinder, 27cm high, bonded to a 14cm x 14cm, 5mm thick water-equivalent plastic base.  This configuration offers zero depth correction.  The water level may be conveniently adjusted using the spigot mounted in the side of the cylinder.

In use, the N23342 ion chamber is placed into a phantom section that is custom machined to position the chamber sensitive volume at the exact beam central axis, with its window flush with the phantom top surface.  The water-filled calibration phantom is then placed on top of the phantom section.  Exact depth is achieved by adding water to the cylinder.

In the same manner, the SWP-1427 may be used on top of the STP-156 phantom that accommodates a small field semiconductor detector for achieving variable build-up.

Model 670

Head Scatter Mini-phantom

The Model 670 water-equivalent, cylinder mini-phantom improves the dosimetric accuracy and reliability of the linear accelerator beam MU calculation by taking into account stray scatter radiation and electron contamination when determining the total radiation dose given.  Head scatter, the stray radiation that bounces around inside the head of a linear accelerator, occurs with each machine.  Some of this radiation is scattered forward and hits the patient to become a contributing factor to the total radiation dose.

Application of this phantom is described in ESTRO Booklet March 1997, “Monitor unit calculation for high energy photon beams" for output, volume scatter and scatter primary ratio measurements.  By making a measurement with the Miniphantom at a reference depth of 10cm, the physicist can investigate and isolate the influence of scatter radiation on a reference dose measured in a slab phantom.

The Mini-phantom consists of a cylinder, 4cm in diameter, 17.5cm long, made of water-equivalent Plastic Water®.  An alignment groove scribed at 10cm serves to indicate the isocenter and coincides with the ion chamber reference point.  The standard chamber cavity, parallel to the phantom axis, is for the classic Farmer-type chamber, but it can be made for any commercially-available cylindrical chamber at no additional cost.  The Mini-phantom may be used with the CNMC Model AL-CSSP chamber stand equipped with a special vertical adaptor or any suitable chamber stand that allows vertical chamber orientation.


Identical to the Model AL-CSS chamber stand, but it includes an additional 90° quick-release clamp to vertically position a Farmer-type chamber or any cylindrical chamber with a stem of up to 12.7mm diameter.  It retains the ability of the Model AL-CSS to hold ion chambers in a horizontal orientation for in-air measurements.

Plastic Water® is a registered trademark of Computerized Imaging Reference Systems, Inc. (C.I.R.S.)


ART Phantoms

for Radiation Treatment Planning

Because of variations of natural human skeletons, unknown calcium loss (approaching osteoporosis in some cases) and contamination by bleaches and other chemical agents in bone preparation, the ART "Superhuman" skeletons are designed and constructed to be both realistic and consistent.  Molds for both the cortical bone and the medullary cavities were made using natural skeletons. Bone uniformity derived by this method acilitates positioning within the soft tissues, eliminating the need to make compromises and modifications, as must be done with natural bones, to fit within fixed molds.  Complete average-sized male and small-sized female phantoms may be assembled externally for film dosimetry or, internally, for TLD.  Plates and tie rods for both assembly methods are included with every phantom.

Soft tissue materials are matched to muscle in specific gravity, mass density and absorption coefficients.  Lungs are molded from syntactic foam, with a specific gravity of 0.30.

The ART phantom is transected horizontally in 1" slices and may be ordered undrilled for film dosimetry or drilled for TLD.  The drilled phantoms are supplied with pins of appropriate material that may be replaced with optional TLD holders.  Holes are available in 5 or 7 mm diameters on 1.5 x 1.5 cm or 3 x 3 cm grids.

Breasts can be ordered in various sizes.  They can be drilled in the AP direction for dosimetry or sliced in frontal planes (drilled or undrilled) for film dosimetry.  The male chest with breasts attached serves as a large female.

Nylon rods for internal assembly pass through registration holes, held by aluminum assembly plates, and clamped by knobs at the ends.  The external assembly plates are larger, allowing tie rods to remain external to the larger phantom contours.

Solid pins are provided with drilled phantoms in appropriate quantity and materials.  TLD holders are available in bone, tissue or lung-equivalent material and in 5 or 7mm O.D.

Break-Apart PIXY

RS-103 or RS-103T
Contains fill ports for the stomach, gall bladder, urinary bladder, right and left kidneys, rectum and sigmoid flexer.  Includes permanent storage case.

RS-104 or RS-104T No fill ports for the stomach, gall bladder, urinary bladder, right and left kidneys, rectum and sigmoid flexer.  Includes permanent storage case.

RS-105 or RS-105T No organs, no fill ports.  Includes permanent storage case.


RSVP Phantom™

Radiosurgery Verification Phantom

The RSVP Phantom™ was developed to provide stereotactic localization and dose verification for radiosurgery machines.  The phantom may be used for a variety of radiosurgery applications, including periodic quality assurance evaluations and acceptance testing.  In addition, the phantom may be used to perform re-evaluations after equipment and software upgrades.

The phantom’s design provides full simulation of the localization and irradiation sequences.  The anatomically accurate head form is filled with water to simulate the radiation absorption and scatter of human soft tissue.  The heavy-duty outer shell is designed to accommodate the anchoring screws.

An internal container called a tumor vessel can be positioned anywhere within the head form by manipulating an external position rod.  This vessel may be filled with a radiation-sensitive gel for alignment evaluations or with TL dosimeters for quantitative dose measurements.  An Exradin Microchamber may also be used with a special optional chamber holder and ball assembly.

Stereotactic Localization – An agarose gel that changes color after exposure to a minimum radiation dose of 40 Gy is used.  A small radio-opaque target is placed inside the gel.  Next, the tumor vessel is positioned within the head form and the radiosurgery head frame is attached to the phantom.  The standard protocols are followed to locate the x, y and z coordinates of the patient’s tumor through angiography, CT, or MR imaging.  The phantom is then mounted in the radiosurgery system and irradiated.  The gel is carefully extracted, sliced and analyzed to determine whether the location and shape of the irradiated portion of the gel corresponds to the desired target location.

Dose Measurements – Either TLD or radiochromic film may be used with appropriate holders to quantify the radiation dose.  The phantom can also accommodate a specially designed chamber holder for the Exradin Microchamber Model A14.

Construction – The shell of the RSVP Phantom™ is formed from a transparent, 1/4" cellulose acetate butyrate sheet, chosen for its strength and low water absorption.  The shell is mounted on a polycarbonate end plate, and the tumor port and cover plate assembly are attached with nylon screws to the end plate.  The cover plate is removable for internal access.  The tumor vessel is attached to the external position rod.  After the desired position is reached, the vessel is locked into place by hand-tightening a lock nut on the rotation ball and a lock bolt on the position rod.  The RSVP Phantom™ includes three tumor vessels and a wooden storage case.

Model STP-145M

Radiosurgery Verification Phantom

The CNMC Model STP-145M combines the STP-145 phantom assembly with a crank-operated, linear-drive mechanism, allowing precision off-axis positioning of the detector.

The phantom assembly slides smoothly on a Teflon® platform, driven by a stainless steel lead screw and stabilized by two stainless steel rods. Each full turn of the hand crank quickly and accurately moves the phantom assembly 1mm. A 5-digit mechanical counter with pushbutton reset capability indicates position to the nearest 0.1 mm. Total detector travel is 16cm or less.

The STP-145M has adjustable feet for leveling the unit. Optional brackets to mount the assembly to a Zemed Danek Linac Scalpel stereotactic radiosurgery system are available.

The STP-145M may be conveniently retrofitted with the optional Model RMD-100-5 and RMD-200-5 remote motor drives that allow detector positioning from a remote location. The detector position is indicated by a 5-digit LCD display with pushbutton zeroing. The convenience of the Model RMD-100-5 and RMD-200-5 provide significant savings to your data acquisition time.

Plastic Slab Phantoms

Acrylic & Polystyrene

Phantom Materials

A typical acrylic or polystyrene phantom is a 25cm cube consisting of one of each fractional thickness, eight 1" thick sections and one 1" thick section which has an ion chamber cavity drilled at 1cm from the nearest surface.  This allows the calibration depth to be adjusted in 0.8mm (1/32") increments over 1cm for photon beams.  A section for a plane-parallel chamber is machined to position the chamber flush with one surface.  In this manner, depths can be achieved for calibrating electron beams in 0.8mm (1/32") steps.

Economy is achieved by using standard thickness material in English System dimensions.  Although the thickness tolerance can vary ±5%, the thickness of each section is individually measured and marked with permanent ink in metric units.

Separate sections are available for adding to an existing phantom or to assemble a phantom with custom dimensions.

Polystyrene plastic (PS), also known as polystyrol, has a density of 1.05g/cm³, which makes it lighter than acrylic.  Historically supplied in clear sheets, polystyrene is currently only supplied in milky white sheets.  It is available in 25 x 25cm sections of varying thickness.

Acrylic phantom material is a clear plastic with the chemical formula (C-5/H-8/O-2)n, polymethylmethacrylate (PMMA).  It is also known under the trade names Lucite, Plexiglas and Perspex. Acrylic has a density of 1.185g/cm³.  It is available in 25 x 25cm sections of varying thickness.

Virtual Water™

Phantom Materials

Virtual Water™ makes routine checks of your linear accelerator easier.  Designed for photon and electron beam calibrations, it eliminates the inconvenience of transporting, setting up and filling water tanks.  Virtual Water™ is free of air and other imperfections and is not affected by humidity or temperature changes.  Skillfully molded and accurately machined in standard dimensions, Virtual Water™ can help you achieve calibrations within 0.5% of the true dose.

Virtual Water™ scatters and attenuates diagnostic and radiotherapy range X-rays the same way as water without the charge storage problems.  It can be used for both photon and electron beam calibrations, including relative ionization, depth dose measurements and absolute calibrations without the need for correction and scaling factors.  Ionization readings obtained in Virtual Water™ are practically the same as those in liquid water for the same depth and exposure duration.

Each batch of Virtual Water™ is tested at an independent calibration lab and verified to be within 0.5% of water at photon energies.  Although 30 x 30cm slabs are most widely used and therefore considered to be a standard size, Virtual Water™ is also available in various thicknesses in 20 x 20cm and 40 x 40cm sizes.

Virtual WaterZ™ is a trademark of Med-Cal, Inc.

Water Phantoms

Water Phantoms

with Depth Positioning Assembly

The CNMC Models WP-3040 and WP-3840 are water phantoms with convenient manual ion chamber depth positioning.  The water tanks are constructed of 3/8" acrylic and provided with side-mounted handles, a drain and a ball valve.

The outstanding feature is the depth positioning assembly that is common to both models and is unique in construction and operation.  The ion chamber holder Teflon® block slides on two stainless steel rods and is driven by a stainless steel lead screw.  One turn of the hand crank quickly and accurately moves the chamber holder block 1mm.  A mechanical counter with push button reset capability indicates depth to the nearest 0.1mm.

The chamber holder block has a 7mm hole with 3 set screws, designed to hold various chamber holders.  The chamber holder that is supplied with the phantom can accommodate cylindrical ion chambers of various diameters, from 3mm to 16mm.  Plane-parallel ion chamber holders are available as an option to accommodate Markus® or NACP chambers and Roos® chambers.

The horizontal off-center positioning is achieved by slicing the depth positioning assembly along the edge of the water tank to the desired position as indicated on the horizontal scale mounted on the end of the tank.  The larger phantom features an additional scale on the side of the tank.

The depth positioning assembly of both models may be easily retro-fitted with an optional Remote Motor Drive that allows chamber depth positioning from a remote location.  The depth is indicated by a digital LCD display with push button zeroing, adding convenience and significant time saving to your monthly routine.

Model WP-6868

3D Radiation Scanning System

The 3D Radiation Scanning System is fast, accurate, simple, and easy to set up.  A RS-485 network cable is the only link with the outside computer.  The scanners are constructed with accuracy, simplicity and portability as priorities.


  • Interfaces with all major treatment planning systems
  • Accuracy of positioning is 0.1 mm or less
  • Accuracy of measurement is 0.5% or less
  • Easy in-room setup with iPad (included)
  • Network cable is the only link to the outside computer
  • iPad pendant
  • Made of clear anodized machined aluminum

System Requirements

Recommended system requirements for optimally running the WP-6868:

  • 2 GB of RAM
  • 100 MB Hard drive space
  • SVGA with 32-bit true color
  • Windows based operating system (Vista or later)
  • Minimum screen resolution:  1024 x 768

Model RMD-100-5

Remote Motor Drive

With the CNMC Model RMD-100-5 Remote Motor Drive you can convert the manual mechanism of the CNMC WP-3040, WP-3840 and STP-145M detector positioning assembly to allow detector positioning from outside of the treatment room, adding convenience and significant savings to your data acquisition time.

Installation is easy, since it makes use of existing threaded holes for mounting the motor drive assembly to the detector positioning assembly.  Although the installation includes adding two drive sprockets, the hand crank is reinstalled on the motor shaft, thereby retaining the original manual positioning and mechanical counter readout functions.

The control/display module is connected to the drive motor by a 15-meter cable for complete control of detector position from the accelerator console.  Its six-digit liquid crystal display indicates the depth position in units of centimeters to 0.001cm.  The RUN switch operates the motor drive in a continuous mode, while the JOG switch provides intermittent operation.  Both switches control the motor drive in up/down directions, indicated on display as + and – respectively.

Model RMD-100-1 may be specified for adaptation to the existing Med-Tec MT-100 and MT-150 water phantoms.  Except for the mounting hardware, all features and technical specifications are indentical to the RMD-100-5.

Model RMD-100-3 may be specified for adaptation to the existing CNMC WP-300 and WP-380 water phantoms.  Except for the mounting hardware, all features and technical specifications are indentical to the RMD-100-5.

Model RMD-200-5

Remote Motor Drive

With the Model RMD-200-5-PC, it is possible to convert the manual, crank-operated depth-positioning mechanism of the CNMC WP-3040 and WP-3840 water phantoms to allow ion chamber positioning from outside the treatment room, using a PC (personal computer) as the control panel, thus adding convenience and significant savings to your monthly routine.

Installation of the motor drive assembly to the depth position mechanism is easy, since it makes use of existing threaded holes.  Although the installation includes adding two drive sprockets, the hand crank is reinstalled on the motor shaft, retaining the original manual positioning and mechanical counter readout functions.

The PC software serves as the control/display unit.  It is connected to the drive motor by a 15-meter cable via an interface unit for complete control of chamber depth from the accelerator console.  The programmability of the PC allows the user to present the depth increments or the entire measurement routine.  This display indicates the depth position, with 0.01cm accuracy assured by optical encoder feedback.

The PC Drive can be supplied with motor mounting hardware for adaptation to water phantoms of older design.  All features and technical specifications remain the same.

Model RMD-200-1-PC may be specified for adaptation to the existing MEDTEC MT-100 and MT-150 water phantoms.

Model RMD-200-3-PC may be specified for adaptation to the existing CNMC WP-300 and WP-380 water phantoms.

Model RMD-200-5-PC

Software for Remote Motor Drive

With the Model RMD-200-PC software, it is now possible to control your RMD-200-X remote motor drive from your PC or MAC from outside of the treatment room, thus adding convenience and significant time saving to your monthly routine.  Installation of the software is easy.  Just copy the .exe file and go.  The hand crank is reinstalled on the motor shaft, retaining the original manual reference point positioning and mechanical counter readout functions.

The PC or MAC computer along with the CNMC motion control software serves as the control/display unit.  It is connected to the drive motor by a 15 meter cable via an interface unit for complete control of chamber depth from the accelerator console.  The programmability of the softwre allows the user to preset the depth increments or the entire measurement routine.  The computer display indicates the depth position, with 0.01cm accuracy assured by optical encoder feedback.

Model RMD-200-1-PC may be specified for adaptation to the existing MEDTEC MT-100 and MT-150 water phantoms.

Model RMD-200-3-PC may be specified for adaptation to the existing CNMC WP-300 and WP-380 water phantoms.

Model RMD-200-5-PC may be specified for adaptation to the existing CNMC WP-3040 and WP-3840 water phantoms.

Universal Lift Carriage

Our Universal Lift Carriage is designed to accurately position large water phantoms when critical measurements need to be made.  This high-precision electromechanical lift carriage has a full 3 inch floor clearance, 4 large diameter wheels, an in independent manually operated braking system to simultaneously lock all 4 wheels and almost 16 inches of vertical movement.

Waterproofing Devices

for Farmer-type Chambers

Various waterproofing kits have been developed by CNMC to effectively waterproof a Farmer-type 0.6cc dosimetry ionization chamber for use in water phantoms.  Their unique design has a distinct advantage over rubber or latex sheaths by eliminating the possibility of talcum powder contamination.

The heart of the design is an acrylic cap that has been machined down to 1mm wall thickness (compatible with TG-51 protocol) at the chamber thimble area.  This housing assembly is designed to accept a Farmer-type ion chamber.  A flexible tube fits snugly over the open end of the cap, and the addition of two rubber O-rings insures a watertight seal.

Since various manufacturers’ chambers may exhibit minor physical differences, CNMC offers several versions to accommodate most chambers.

As with latex and rubber sheaths, the flexible tubing may harden over time and should be inspected before use and replaced periodically.  However, this tubing is relatively inexpensive and is readily obtained from CNMC or through the hospital’s surgical supplier.

WPK-75 for NE Chambers

This set consists of an acrylic cap with M11x.75 thread which fits NE Farmer-type chambers, six 5/8" diameter Penrose drainage tubes and two 5/8" diameter O-rings.

WPK-75C for Capintec PR-06C

This set consists of a larger 3/4" acrylic cap with M11x.75 thread, six 3/4" diameter Penrose drainage tubes and two 3/4" diameter o-rings to accommodate the cable connector of the PR-06C.  It also fits NE Farmer-type chambers.

WPK-100 for PTW Farmer® Chambers

This set consists of an acrylic cap with M11x1 thread which fits all PTW Farmer-type chambers, six 5/8" diameter Penrose drainage tubes and two 5/8" diameter O-rings.

WPK-691 Universal Waterproofing Kit

This set contains a uniquely designed acrylic waterproofing cap without the threads.  An internal O-ring with air bypass holds all Farmer-type ion chambers securely, including the Capintec PR-06G and PR-06C.  The set includes six 3/4" diameter Penrose drainage tubes that can accommodate the cable connector of the PR-06C without the need for machining.

2513A Waterproofing Sheath

These latex sheaths are molded to conform to all outside dimensions of PTW, NE and Capintec PR-06G Farmer-type ion chambers.  To keep the inside walls from sticking while in storage, the sheaths are supplied dusted with talcum powder.  The sheaths are more difficult to install, remove and store, but they can be used successfully to waterproof Farmer-type chambers providing that extreme caution is taken to prevent talcum powder contamination of the chamber.

PTW Farmer® is a registered trademark of PTW Freiburg and PTW New York.