Journal of Medical Physics

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1991| January-March | Volume 16 | Issue 1
Online since April 24, 2009

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Acceptance Tests For Clinac-1800 : A Dual Photon Medical Linear Accelerator
Anil.K Sharma, Sanjay.S Supe, S L Keshava
January-March 1991, 16(1):1-9

Acceptance tests form an important part of machine installation procedures. Acceptance tests were carried out on CLINAC-1800 accelerator installed at KMIO, as recommended by Varian Associates, U.S.A. in accordance with the German Standard DIN 6847. The tests included radiation survey, mechanical tests, radiation isocenter test, photon beam performance, electron beam performance and dosimetry tests. The results of these acceptance tests were very satisfactory- Tests such as depth dose, field flatness, field symmetry constitute routine quality assurance programme for an accelerator.

[ABSTRACT] Full text not available [PDF]

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Tables For The Normalization Of Time Dose Fractionation Factors For Normal And Tumour Tissues
Sanjay Sudhakar Supe, Anil Kumar Sharma
January-March 1991, 16(1):21-27

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Postal Quality Assurance Program For Diagnostic Radiology Facilities
Vaidy Bala
January-March 1991, 16(1):10-17

Postal Quality Assurance tests carried out by the Saskatchewan Government's Radiation Safety Unit during the last two years have proven very reliable and economical. This has the potential to identify the performance of rapidly deteriorating X ray tubes and other imaging problems and take prompt corrective action.

[ABSTRACT] Full text not available [PDF]

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Measurement Of Scattered Radiation At Tissue Lead Interface In High Energy Electron Beams
R C Joshi, T Ganesh, Rajendra Kumar, Sandeep Singhal, G K Rath
January-March 1991, 16(1):18-20

In electron beam treatment introduction of a metal sheet under the tissue to shield vital organs increases the dose to the tissue at the junction due to the back scattering of electrons from the metal. Investigations were made to observe this effect for electron energies from 9 to 20 MeV. It was found that the increase in the relative ionisation is from 26 to 50 percent at the tissue-lead junction. The range of the back scattered electrons for each electron energy was determined by introducing polystyrene (density = 1.02 gm/cc) and wax sheets between the ionisation chamber and metal. A 1.0 gm per sq. cm thick wax sheet (density = 0.85 gm/cc) reduces the relative ionisation to 101, 102.6, 106.6 and 106% for 9,12,16, and 20 MeV electron beams respectively.

[ABSTRACT] Full text not available [PDF]

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Clinical Experience In Introducing RT Work Stations
Torgil Moller, Inger-Lena Lamm
January-March 1991, 16(1):34-35

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System Test As Part Of A Quality Assurance Program For 3D Radiotherapy Planning System
D Meenenga, R Boesecke, W Schlegel, W J Lorenz
January-March 1991, 16(1):28-30

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Optimization Of Radiation Dose Distribution By Modulated Irradiation Fields
J Burkelbach, T Bortfeld, G Becker, R Boesecke, W Schlegel, W J Lorenz
January-March 1991, 16(1):31-33

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Low Dose Exposures And Their Biological Effects
Uma.P Devi
January-March 1991, 16(1):36-39

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"The Role Of Computers In Cancer Therapy"
R Chidrambaram
January-March 1991, 16(1):42-43

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