Radiosurgical Treatment Verification Using Removable Megavoltage Radiation Detectors

Radiosurgical Treatment Verification Using Removable Megavoltage Radiation Detectors

Introduction Accurate dose delivery is critical to the success of stereotactic radiosurgery. Unfortunately, verification of the accuracy of treatment delivery remains a challenging problem. Existing radiosurgery delivery paradigms are limited in their ability to verify the accurate delivery of radiation beams using data sampled from the beam after it has traversed the patient. The Zap-X Radiosu...

Dosimetric verification of pre-treatment intensity modulated radiation therapy in the commissioning process

Background: Commissioning tests are recommended before implementing Intensity Modulated Radiation Therapy. This study evaluated five different plans of IMRT mocks for different modulation indices. Materials and Methods: IMRT tests were done in slab phantom for both 6MV and 15 MV photon energies using a 2D array ion chamber dosimeter. Results: The acceptance criteria were based on 3% /3mm. All t...

Investigation into the radiobiological consequences of pre-treatment verification imaging with megavoltage X-rays in radiotherapy.

OBJECTIVE The aim of this study was to investigate the effect of pre-treatment verification imaging with megavoltage X-rays on cancer and normal cell survival in vitro and to compare the findings with theoretically modelled data. Since the dose received from pre-treatment imaging can be significant, the incorporation of this dose at the planning stage of treatment has been suggested. METHODS ...

Detectors of Radiation

Optical Radiation Detectors & Noise

In this lab, we investigated the responsivity, time response, and noise performance of various photodetectors, including thermal detectors, silicon photodiodes, and photomultiplier tubes (PMT). A standard helium-neon gas laser (HeNe), operated in the red (632.8 nm), was used as the light source for the measurements of the silicon photodiodes. A flashlight served as a radiation source to measure...