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Biomedical subjects

R G Lane

Publications and source records attributed to R G Lane.

At least 37 records · Page 2Linked to original sources
PubMed1980

Computation of dose distributions for radioactive seed implants.

An interactive treatment planning program for the computation of dose distributions for 125I and 192Ir seed implants of up to 300 sources is described. The seed coordinates are entered using either the keyboard or a sonic digitizer from either orthogonal or stereo films. The program produces a dose matrix which can be displayed and plotted directly or combined with the putput of other treatment planning programs to provide composite plans for treatments using multiple modalities. Seeds of different activities can be combined within a single plan. The program uses two-letter mnemonics for specifying the available options, among which are commands for choosing standard antero-posterior, lateral, and transverse plans.

Brachytherapy↗
PubMed1978

A whole body repositioning system.

A versatile and easily used whole body repositioning system is described. It may be quickly and inexpensively constructed. The system has been found to be particularly helpful in the extended field treatment of Hodgkin disease, head and neck treatments, and in tumors of the abdomen and pelvis.

Radiotherapy↗
PubMed1978

Electron beam calibration constants.

Electron treatment beam calibration constants are tabulated in a convenient form for mean incident electron energies, Eo, of 6 to 21 MeV; and practical reanges, Rp, of 2.75 to 10.53 cm of water. Values of mean electron energy at depth Ed, chamber radius correction factors (Kp), and CE factors may be readily obtained from this chart.

Electrons↗
PubMed1977

A tissue compensation source-to-skin measurement system.

An easy to use, low-cost system for measuring the source-to-skin distance used in determining tissue compensation requirements is described. These measurements can be performed with accuracy and precision for any treatment field size and at any treatment beam angle. The system can be used in conjuction with several different tissue compensation methods.

Humans↗
PubMed1975

Extended field treatment flatness filter for 4 MV linear accelerators.

An auxiliary flatness filter for large field treatment on 4 MV linear accelerator provides an isodose distribution which does not vary more than 6% over the central 80% of the axis of a 32 x 32-cm field at 80 cm in air, and at a 2.5, 6, and 12-cm depth in water. This lead disc filter does not affect the central axis depth dose values, and results in only a 16% reduction in dose rate on the central field axis.

Radiotherapy, High-Energy↗
PubMed1975

A wedge filter interlock system for 4 MV linear accelerators.

The wedge filter interlock system on a 4 MV linear accelerator was modified to ensure proper selection and placement of filter. By using a series of microswitches to replace the two-pin connection for each wedge, proper placement of the wedge in the treatment beam was ensured. Both the chain and plug were eliminated by using a 6 pole, 6 position sub-miniature rotary switch to produce the remaining connections.

Filtration↗
PubMed1975

Malfunction of linear accelerator dose monitoring systems.

Malfunctions of the dose monitoring systems of two linear accelerators were studied. A variation of plus or minus 2.5% over an air density correction factor range from 1.02 to 1.07 was measured, suggesting that the ionization-type monitor chambers were open to the atmosphere. An average variation of minus 2.0% was present between early morning calibrations and those performed later in the day. Any variation caused by changes in control console temperature was within experimental error. This type of malfunction can lead to errors in delivered doses of 5%.

Electrons↗
PubMed1975

Rapid treatment field light adjustment for linear accelerators.

A technique for rapid, accurate alignment of the light field to the radiation field is presented. When these two fields are coincident, a permanent template results which minimizes machine down time when this procedure is required during the treatment day.

Humans↗