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In vivo dosimetry using a single diode for megavoltage photon beam radiotherapy: implementation and response
V C Colussi1, A S Beddar, T J Kinsella
1Department of Radiation Oncology, Case Western Reserve University School of Medicine and University Hospitals of Cleveland, 11100 Euclid Cleveland, Ohio 44106, USA.
Journal of Applied Clinical Medical Physics
|November 1, 2001
Summary
This study validates using a single ISORAD (p-type) diode for in vivo dosimetry across all radiation therapy energies. This simplifies patient monitoring and ensures accurate dose delivery in megavoltage photon beam radiotherapy.
Area of Science:
- Medical Physics
- Radiation Oncology
- Dosimetry
Background:
- In vivo dosimetry is crucial for identifying deviations in radiation therapy delivery.
- Current methods may require multiple detectors for different energy ranges.
Purpose of the Study:
- To investigate the feasibility of using a single diode for in vivo dosimetry across the entire therapeutic energy range.
- To evaluate the performance of Sun Nuclear Corporation's ISORAD (p-type) diodes in clinical settings.
Main Methods:
- Tested ISORAD (p-type) diodes for low-, intermediate-, and high-energy ranges.
- Clinically monitored entrance doses using ISORAD (p-type) and QED diodes.
- Characterized ISORAD (p-type) diode response to source-to-surface distance, field size, wedge modifiers, temperature, and orientation.
Main Results:
- ISORAD (p-type) diodes showed dose readings closer to expected values than QED diodes.
- High-energy ISORAD (p-type) diode response variation was within +/-5% for most clinical setups.
- The high-energy diode offers amplified readings if incorrect energy is used.
Conclusions:
- A single high-energy ISORAD (p-type) diode can be reliably used for in vivo dosimetry across all megavoltage photon beam energies.
- This approach simplifies clinical practice and enhances patient safety in radiation therapy.