Journal of Medical Physics
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   1992| January-March  | Volume 17 | Issue 1  
    Online since April 24, 2009

 
 
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Computerized Tomography In Radiation Therapy Planning
Satyajit Pradhan, Niloy Ranjan Datta, Sundar Ayyagari, Shelly Hukku, Maria.KJ Das, Shaleen Kumar, Banibrata Mazumdar
January-March 1992, 17(1):6-10
Advent of computerized tomography (CT) has revolutionized radiotherapy treatment planning (RTP). CT facilitates localization of tumour and normal tissues accurately. Multislice CT scanning produces a three dimensional matrix of information elements from which two dimensional images in any plane can be reconstructed and so can help in 3D treatment planning. Over the period, a number of important differences have emerged between diagnostic and therapeutic CT scans. The usefulness of CT scans for RTP is discussed and the technique followed at our institute for RTP using CT scans is presented.
[ABSTRACT]   Full text not available  [PDF]
  504 104 -
Evaluation Of The Performance Parameters And Quality Assurance For Magnetic Resonance Imaging Systems
S Khushu, S B Mehta, R Jaysunder, R K Jain, A Jena
January-March 1992, 17(1):20-26
Evaluation of the performance parameters are needed to assure proper system performance and represent a valuable source of qualitative and quantitative data for routine quality control testing. The performance parameters that require regular evaluation in magnetic resonance imaging systems are discussed here. These parameters include the Resonance frequency, Magnetic field homogeneity, Image uniformity, spatial resolution, S/N ratio; Gradient linearity, Standard reference measurement, 1st & 2nd Echo artifacts and Echo intensities for spin echo measurements. The aim of the quality assurance is to detect deviations in the performance of the equipment well before they actually show up in the clinical images in the form of image artifacts or degraded images.
[ABSTRACT]   Full text not available  [PDF]
  488 70 -
The Impact Of Pc-Based Treatment Planning System In Radiation Therapy : 1. Sources Of Inaccuracies
R M Nehru, A M Pendse, P S Viswanathan, K A Dinshaw
January-March 1992, 17(1):1-5
There, are a few indigenously developed personal computers (PC) based treatment planning systems in India. They directly have many roles to play improve the quality of radiotherapy. In this paper, we present details of sources of inaccuracies that may arise in the PC based treatment planning systems and a few guidelines to correct them. From this study, it can be concluded that a thorough checking of the treatment planning systems is very much needed to know the limitations of the systems as well as the most appropriate ways in which the system can be used efficiently.
[ABSTRACT]   Full text not available  [PDF]
  442 62 -
Effects Of Gamma Radiations On Certain Tissues Of Heteropneustes Fossilis Bloch
R K Purothit, N Rathore, P Ahuluwalia, M Srivastava, M L Gupta
January-March 1992, 17(1):17-19
In the present investigation effect of gamma radiation on certain tissues (kidney, stomach and gills) of Heteropneustes fossilis Bloch, an Indian Cat fish, were studied. The fish were irradiated with 10 Gy of gamma radiations at the dose rate of 1.60 Gy/minute from a 6co source. Five fish were autopsied at each post-irradiation time of 1.2.3, 7.15 and 30 days. Radiation induced histopathology was observed in all the tissues studied. The radiolesions appeared on day-1 after exposure which became exaggerated on day-2 and 3. Signs of recovery were noticed on day - 7 which progressed on day-15 and normal histology was observed on day-30.
[ABSTRACT]   Full text not available  [PDF]
  402 73 -
Designing Of Central Shield In Ca Cx Cases
P Suresh, V C Patel, R K Vyas
January-March 1992, 17(1):27-27
This paper deals with the designing aspects of central shielding block for external radiotherapy used in treatment of Ca Cx patients who are already treated or are going to be treated with ICR treatments. The designing aspects are discussed in detail particularly for the region between point A and point B.
[ABSTRACT]   Full text not available  [PDF]
  414 36 -
Simplified Technique For Selectron Dosimetry
V C Patel, P Suresh
January-March 1992, 17(1):11-12
Dosimetry in brachytherapy applications using Selectron remote after loading unit requires techniques which will help in planning the treatment. A simple method given here will prove useful for this purpose and also help the physicists in verification of these plans.
[ABSTRACT]   Full text not available  [PDF]
  388 52 -
Biological Bases Of ICRP 60 Recommendations
S D Soman, B S Rao
January-March 1992, 17(1):30-38
Full text not available  [PDF]
  228 108 -
Radioidine Thyroid therapy From The Physicist's Point Of View
Oscar.A Chomicki, Tadeusz Gorowski
January-March 1992, 17(1):13-16
Full text not available  [PDF]
  245 76 -
Cobalt Therapy Reassessed
U.B. Tripathi
January-March 1992, 17(1):28-29
Full text not available  [PDF]
  223 38 -
 
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