A performance assessment was made of the Gulmay D3300 kilovoltage (combined superficial and orthovoltage) X-ray therapy unit. Results are presented for the key dosimetric beam parameters required for routine patient treatment. This unit is relatively new to the UK...
The American Association of Physicists in Medicine (AAPM) presents a new protocol, developed by the Radiation Therapy Committee Task Group 61, for reference dosimetry of low- and medium-energy x rays for radiotherapy and radiobiology math formula It is based on ionization chambers calibrated in air in terms of air kerma. If the point of interest is at or close to the surface, one unified approach over the entire energy range shall be used to determine absorbed dose to water at the surface of a water phantom based on an in-air measurement (the “in-air” method). If the point of interest is at a depth, an in-water measurement at a depth of 2 cm shall be used for tube potentials ⩾100 kV (the “in-phantom” method). The in-phantom method is not recommended for tube potentials <100 kV. Guidelines are provided to determine the dose at other points in water and the dose at the surface of other biological materials of interest. The protocol is based on an up-to-date data set of basic dosimetry parameters, which produce consistent dose values for the two methods recommended. Estimates of uncertainties on the final dose values are also presented.
C M Ma, C W Coffey, L A DeWerd, C Liu, R Nath, S M Seltzer & J P Seuntjens
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PURPOSE: To retrospectively review patterns of failure, cosmesis, and outcomes according to treatment modality of patients with histologically confirmed epithelial skin cancer. METHODS AND MATERIALS: The records of 468 patients having 531 lesions were analyzed; 389...
BCC is a slow-growing, locally invasive malignant epidermal skin tumour which mainly affects Caucasians. BCC tends to infiltrate tissues in a three-dimensional contiguous fashion through the irregular growth of sub-clinical anger-like outgrowths. Metastasis is...
PURPOSE: To evaluate the impact of local superficial radiotherapy with respect to local control, survival, and toxicity for patients with "minimal" stage IA cutaneous T-cell lymphoma (Mycosis Fungoides). METHODS AND MATERIALS: Between 1954 and 1996 a total of 21...
BACKGROUND: Although radiotherapy of skin tumors has lost its former preeminence, there is still need for this modality. The aim of this study was, therefore, to determine the frequency of radiogenic ulcers and tumors following soft x-ray therapy of skin lesions....
This is a retrospective analysis of the results of kilovoltage irradiation given to prevent the regrowth of 203 keloids excised at the University of Iowa Hospitals and Clinics, Iowa City, Iowa, Lutheran Hospital in Moline, Illinois, and Mercy Hospital in Cedar Rapids,...
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