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Biomedical subjects

W G Connor

Publications and source records attributed to W G Connor.

21 records · Page 2Linked to original sources
PubMedDate not supplied

Method for gantry angle repositioning on rotational teletherapy equipment.

Repositioning errors for given angles have been found to be as large as +/-0.5 degrees. Errors of this magnitude are undesirable and unnecessary. To overcome this difficulty, a small laser was mounted to the counterweight of our accelerator with its light beam projected at 90 degrees to the axis of the x-ray beam. The light beam is used as a lever arm to indicate large distances (0.125 in.) for small changes in gantry angle (0.1 degrees). Gantry angles can easily be respositioned within 0.1 degrees. Routine use of the laser beam indicator has reduced the time taken to reposition the gantry.

Lasers↗
PubMedDate not supplied

Thermometry considerations in localized hyperthermia.

The introduction of local hyperthermia as a method of cancer therapy implies the necessity of quantitative measurements of the thermal dose. Our intention is to describe the nature of the problem, both physically and physiologically, with illustrations drawn from thermographic measurements in phantoms and in animals. The characteristics of a thermometry calibration facility are described. Some measurement problems associated with conventional thermometer probes are mentioned and several new thermometers which were developed for use in the electromagnetic fields are reviewed. We present some of the concepts that will guide the development of noninvasive thermometry. Systemic hyperthermia is not considered. We recommend that other reviews specifically directed toward localized hyperthermia be prepared on the methods of heating and on thermal physiological problems.

Adenoma↗