Best Medical Canada - MOSFET DOSIMETRY

By: Thomson & Nielsen Electronics  09-12-2011

Best Medical Canada offers three different styles of MOSFET dosimeters as shown in the table below.  With each of these dosimeters there are also options that can be selected.  All of our dosimeters have the same unique features:

  • One calibration factor for all photon & electron modalities in the radiotherapy energy range
  • Isotropic (± 3% or better for 360º)
  • Active region of 0.2 x 0.2 mm
  • Permits pinpoint measurement without patient shielding
  • Dose-rate and temperature independent
  • Unobtrusive in procedures
  • Lightweight and flexible
  • Multiple dosimeter capability with one Reader


Width of Flex

Length of Flex

Thickness of Flex

Common Use

Standard MOSFET

2.5 mm

200 mm

0.3 mm

Dose verification during radiotherapy treatments; beam QA


1.0 mm

375 mm

0.3 mm

Fits down a 6Fr catheter for dose verification during HDR brachytherapy procedures

1.5 mm

460 mm

1.3 mm

Measurement of urethral dose during prostate brachytherapy procedures



High Sensitivity

These dosimeters are made more sensitive to radiation.  Standard dosimeters in standard bias (all readers have two bias settings: std and high) have a nominal sensitivity of 1 mV/cGy.  High sensitivity dosimeters in standard bias have 3 mV/cGy, while high sensitivity dosimeters used in high bias will yield a nominal sensitivity of 9 mV/cGy.


Dosimeters can be reinforced to increase strength and durability.

Radiopaque Marker

A marker can be placed on the end of the dosimeters to make them visible during imaging (e.g. CT)

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Best Medical Canada - Phantoms Compatible with MOSFETs

With five dose points samples on the film and four dose points on an orthogonal plan, this QA procedure is adequate in theory and in practice.. This product was developed in association with Professor X. Wu, University of Miami, and is manufactured exclusively by Best Medical Canada. One of the planes, containing five MOSFET detection points, is the dividing plane of the two sub-phantoms where a film is housed.


Best Medical Canada - Build-up Caps

Best Medical Canada offers a custom designed Build-up Cap for use with MOSFET Dosimeters, which allows for depth dose measurements over a wide range of energies. Precise dose measurement verifies that the target volume area has been treated with the appropriate dose, while sparing surrounding tissue and organs. MOSFET dosimeters have only 0.8mm inherent build-up, which allows for flexibility in measuring surface dose as well as dose at Dmax.


Best Medical Canada - Portable Dosimeter

The Portable Dosimeter supports up to two simultaneous dose points with any of the Best Medical Canada single MOSFETs on standard or high bias setting for optimal dose reproducibility. For one-to-two dose points, the Portable dosimeter is a fast, simple solution for patient dosimetry that can be used for a wide range of applications in radiotherapy and radiology.


Best Medical Canada - mobileMOSFET

The system consists of Remote Monitoring Dose Verification Software, wall-mounted BlueTooth™ Wireless Transceiver, and a small Reader Module that acts as a channel between the MOSFET and software. This new wireless system is entirely software driven allowing for complete control of one or more systems from a remote PC. With multiple systems and transceivers, one PC can read MOSFETs in multiple treatment rooms simultaneously.