Linear 5ive MOSFET Array, Extreme Sensitivity

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Linear 5ive MOSFET Array, Extreme Sensitivity.

The Linear 5ive MOSFET Array is ideal for LDR/HDR Brachytherapy and IMRT QA.

The Array contains five isotropic, energy independent MOSFET dosimeters, at 2cm intervals.  The MOSFETs on the array can be read simultaneously, facilitating multiple dose measurements at several spatial points.  The radio-opaque marker, located at the tip of the array, enables visualization under X-Ray imaging (CT, Fluoroscopy), allowing for five dosimetry points to be accurately located and easily compared to target doses.

• Suitable for in-vivo dosimetry and beam QA

• For use in both electron and photon modalities

• Isotropic response for 360° gantry angles

• Dose rate and energy independent

• Visible under CT or Fluoroscopy imaging

• Waterproof, resistant to body fluids and liquid sterilization

• Small, lightweight, flexible, and rugged for extensive handling

Applications: 
The isotropic Linear 5ive Array, with excellent reproducibility and linearity, is the tool of choice for a variety of radiotherapy applications such as in-vivo dosimetry and Beam Quality Assurance.

LDR Implant/ HDR Brachytherapy: 
The array can be used effectively for direct measurement of intra-cavitary dose profiles.  For example, during gynecological and prostate procedures, five dose points can be read directly from a computer, displaying the dose profile of the organ at risk in real-time.  This is then compared to the planned target dose, allowing for immediate assessments of post-implant base and apex dose, as well as the dose to the organs at risk (eg. urethra, rectum, or bladder).

Beam Quality Assurance: 
Two arrays crossing at the isocenter of a beam will provide quick 2D dose profiling with 10 simultaneous dose point readings for the X and Y-axes.  Since arrays are isotropic, multiple beams at different gantry angles, as in IMRT, can be accurately and quickly checked.

Dynamic Dose Measurements for Brachytherapy Dosimetry
The Linear 5ive MOSFET Array™, when used in combination with the mobileMOSFET™, is the first and only commercially available combination that allows for real-time quality assurance of all brachytherapy procedures, without a significant investment in extra time.

Real-time dose profiling is provided by the in-vivo use of a mobileMOSFET Wireless Dosimetry System.  The Linear Array is used for various HDR applications such as prostate and gynecological brachytherapy using Item 322-360.

When placed on the surface of the breast, the array can also validate Mammosite™ treatments.  Implant and LDR dosimetry is performed using the higher sensitivity model, Item 322-362.

When inserted directly into a urethral catheter, the dose results provide immediate assessment of post-implant base and apex dose coverage, as well as the dose to organs at risk such as the urethra, rectum or bladder.  This real-time dose feedback allows assessing the quality of the seed implant program in LDR and HDR brachytherapy.  Absolute dose measurements or dose rate measurements are obtained in real-time.  This helps to validate the quality of the treatment, and ultimately the quality of life for the patient. 

Compatibility
• mobileMOSFET Dose Verification System

• AutoSense Dose Verification System & Dual Bias Supply for Linear 5ive MOSFET Array

• Not compatible with MOSFET 20 Dose Verification System

Radiation Characteristics
• 20,000 mV lifetime (~20,000 cGy on standard sensitivity setting)

• Five active detection points (0.04 mm2 each)

• Suitable for photon and electron modalities

• Isotropic response (± 3% for 360°)

• Temperature independent

• Visible under CT or Fluoroscopy with a radio-opaque tungsten marker at the tip

Additional Applications
• IMRT IGRT, IORT, QA and In vivo

• Rectal Dose Measurements

• Skin Dosimetry

• Beam Profiling

• Fluoroscopy / CT Dose Verification

• External beam radiotherapy / TBI

Dimensions
1.5 mm W x 46 cm L x 1.3 mm T
2 cm Inter-MOSFET Spacing

Three linear arrays with different sensitivities are offered to accommodate all clinical and research applications
Common Use:  LDR Brachytherapy, diagnostic x-rays
Standard Sensitivity Bias:  25.8 mV/cGy (for ¹²⁵I)
High Sensitivity Bias:  37.2 mV/cGy (for ¹²⁵I)

Note:  Sensitivities noted above are under full build-up (⁶⁰Co)

All of these arrays continue to yield dose reproducibility at standard sensitivity bias at 1s.
20 cGy:  < 2%
200 cGy:  < 1.5%