Search Results - "Butson, M. J."

Electron contamination modeling and skin dose in 6 MV longitudinal field MRIgRT: Impact of the MRI and MRI fringe field by Oborn, B. M., Metcalfe, P. E., Butson, M. J., Rosenfeld, A. B., Keall, P. J.

“…Purpose: In recent times, longitudinal field MRI-linac systems have been proposed for 6 MV MRI-guided radiotherapy (MRIgRT). The magnetic field is parallel…”
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Absorption spectra variations of EBT radiochromic film from radiation exposure by Butson, M J, Cheung, T, Yu, P K N

“…Gafchromic EBT radiochromic film is one of the newest radiation-induced auto-developing x-ray analysis films available for therapeutic radiation dosimetry in…”
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Measurement of radiotherapy x-ray skin dose on a chest wall phantom by Quach, K. Y., Morales, J., Butson, M. J., Rosenfeld, A. B., Metcalfe, P. E.

“…Sufficient skin dose needs to be delivered by a radiotherapy chest wall treatment regimen to ensure the probability of a near surface tumor recurrence is…”
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Monte Carlo characterization of skin doses in 6 MV transverse field MRI-linac systems: Effect of field size, surface orientation, magnetic field strength, and exit bolus by Oborn, B. M., Metcalfe, P. E., Butson, M. J., Rosenfeld, A. B.

“…Purpose: The main focus of this work is to continue investigations into the Monte Carlo predicted skin doses seen in MRI-guided radiotherapy. In particular,…”
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High resolution entry and exit Monte Carlo dose calculations from a linear accelerator 6 MV beam under the influence of transverse magnetic fields by Oborn, B. M., Metcalfe, P. E., Butson, M. J., Rosenfeld, A. B.

“…A current concern with 6 MV transverse field MRI-linac hybrid systems is the predicted increases in skin dose (both the entry and exit sides) caused by the…”
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Effects of read-out light sources and ambient light on radiochromic film by Butson, M J, Yu, P K, Metcalfe, P E

“…Both read-out light sources and ambient light sources can produce a marked effect on coloration of radiochromic film. Fluorescent, helium neon laser, light…”
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Dose and Absorption Spectra Response of EBT2 Gafchromic Film to High Energy X-rays by Butson, M. J., Cheung, T., Yu, P. K. N., Alnawaf, H.

“…With new advancements in radiochromic film designs and sensitivity to suit different niche applications, EBT2 is the latest offering for the megavoltage…”
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Scanning Orientation Effects on Gafchromic EBT Film Dosimetry by Butson, M J, Cheung, T, Yu, P K N

“…Gafchromic EBT film, a new high sensitivity radio-chromic film has been tested for variations in optical properties due to scanning orientation. Gafchromic EBT…”
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Evaluation of the Magnitude of EBT Gafchromic Film Polarization Effects by Butson, M. J., Cheung, T., Yu, P. K. N.

“…Gafchromic EBT film, has become a main dosimetric tools for quantitative evaluation of radiation doses in radiation therapy application. One aspect of…”
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Measurement of off-axis and peripheral skin dose using radiochromic film by Butson, M J, Yu, P K, Metcalfe, P E

“…A radiotheraphy skin dose profile can be obtained with radiochromic film. The central axis skin dose relative to Dmax for a 10 x 10 cm2 field size was found to…”
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Assessment of large single-fraction, low-energy X-ray dose with radiochromic film by Butson, M J, Cheung, T, Yu, P K, Metcalfe, P E

“…To investigate the accuracy of in vivo dosimetry using radiochromic film for large single-fraction, low-energy irradiations. Gafchromic MD-55-2 radiochromic…”
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Radiochromic film as a radiotherapy surface-dose detector by Butson, M J, Mathur, J N, Metcalfe, P E

“…Radiochromic film is shown to be a useful surface-dose detector for radiotherapy x-ray beams. Central-axis percentage surface-dose results as measured by…”
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Blood irradiation with accelerator produced electron beams by Butson, M J, Cheung, T, Yu, P K, Stokes, M J

“…Blood and blood products are irradiated with gamma rays to reduce the risk of graft versus host disease (GVHD). A simple technique using electron beams…”
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Radiochromic Film for Verification of Superficial X-ray Backscatter Factors by Butson, M J, Cheung, T, Yu, P K N

“…Accurate calculation and knowledge of backscatter factors (BSF) in superficial x-ray radiotherapy is required to perform accurate absorbed dose determination…”
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Measuring Energy Response for RTQA Radiochromic Film to Improve Quality Assurance Procedures by Butson, M. J., Cheung, T., Yu, P. K. N.

“…RTQA Gafchromic, radiochromic film is assessed for its radiation energy dependence in photon beams ranging from superficial to megavoltage energies. RTQA…”
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Dosimetry of blood irradiation with radiochromic film by Butson, M J, Yu, P K, Cheung, T, Carolan, M G, Quach, K Y, Arnold, A, Metcalfe, P E

“…It has been shown that radiochromic film is an ideal dosimeter for assessment and verification of delivered dose to irradiated blood products. Using a parallel…”
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Effects on skin dose from unwanted air gaps under bolus in photon beam radiotherapy by Butson, Martin J., Cheung, Tsang, Yu, Peter, Metcalfe, Peter

“…The dose under small air gaps located under bolus material of up to 10 mm have been measured with an Attix parallel plate ionization chamber and radiochromic…”
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A new radiotherapy surface dose detector:the MOSFET by Butson, M J, Rozenfeld, A, Mathur, J N, Carolan, M, Wong, T P, Metcalfe, P E

“…Radiotherapy x-ray and electron beam surface doses are accurately measurable by use of a MOS-FET detector system. The MOSFET (Metal Oxide Semiconductor Field…”
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Radiochromic film dosimetry in water phantoms by Butson, M J, Cheung, T, Yu, P K

“…Radiochromic film is investigated for use in dosimetry in water phantoms as opposed to solid phantoms. Investigations are performed to measure the penetration…”
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Measurement of centi-Gray X-ray dose levels with radiochromic film by Tsang Cheung, Yu, P.K.N., Butson, M.J.

“…X-ray doses in the range of centi-Gray can be detected and accurately measured on a relative scale for low energy X-rays using a high sensitivity radiochromic…”
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