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Biomedical subjects

C K Bomford

Publications and source records attributed to C K Bomford.

8 recordsLinked to original sources
PubMed1987

The Sheffield stereotactic radiosurgery unit: physical characteristics and principles of operation.

A stereotactic radiosurgery unit was commissioned in Weston Park Hospital in the summer of 1985. This paper describes the design, principles of operation and the safety features of the multiple-beam cobalt-60 therapy unit. The measurement of the dose around the extremely sharp focus produced by the 201 beams is discussed and the results compared with computed distributions. The results of the radiation protection survey are presented and the design of the purpose-built treatment suite is discussed. The procedure for treatment of a patient is outlined.

Brain↗
PubMed1979

A less empirical method of representing megavoltage beams for use in rapid radiotherapy dose calculations.

A large number of initial measurements are needed for accurate computation of radiotherapy dose distributions directly from stored data on the dose distribution of single radiation beams. Because of this, interest has been shown in alternative methods which use empirical formulae to represent the dose distributions of single beams. These can be easier to implement but are less directly related to measured quantities and may be of limited validity. A method of representing radiotherapy beams is proposed which closely approximates their radiation physics, in order to calculate the dose at any point by a simple algorithm directly from a small number of initial dose measurements. The method is of wide validity, probably including all megavoltage radiations for which Compton scattering is the dominant interaction in tissue. The accuracy of the method is demonstrated by application to an 8 MV linear accelerator and a cobalt 60 machine.

Humans↗
PubMedDate not supplied

Reduced output of orthovoltage radiotherapy units.

Three causes of reduced output of orthovoltage radiotherapy units have recently been reported in this journal, each being due to faults external to the tube insert. A further incident is now reported where the output was reduced by 30% due to the tungsten foil becoming partially detached from the anode, while the unit continued to operate normally. The possible cause and the prevention of a repeat occurrence are discussed.

Radiotherapy↗