Journal of Medical Physics
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   1990| January-March  | Volume 15 | Issue 1  
    Online since April 24, 2009

 
 
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Quality Assurance In Diagnostic Radiology
D Chawla, S.C Saraf, O.P Tiwari, M.S Dvivedi
January-March 1990, 15(1):58-62
Quality assurance is playing a vital role in day to day life, hence necessary. Quality assurance test in this study was conducted on 20 x-ray machines. KVp test shows acceptable variation in 31.4% Collimator and beam alignment tests show acceptable variation in 66.7% and 31.6% respectively. Timer test shows acceptable variation in 20.4%. Output of 93.5% kVp stations shows acceptable variation. Focal spot deterioration in 47.5% was acceptable. Coefficient of linearity in 86.1 % was good. Good film screen contact was found in 72.2%. Poor functioning of any parameter may lead to retake of x-ray, which in turn increases cost and radiation dose to patients and staff. Therefore, it is emphasized that every x-ray machine must undergo quality assurance test at regular intervals.
[ABSTRACT]   Full text not available  [PDF]
  505 165 -
Quality Control In Film Processing
K.S Jeetha, M.M Rehani, S Narayanan, M Berry
January-March 1990, 15(1):53-57
From a review of causes of film retake, the important role played by film processing technique is evident. In this study, a) we standardized the technique of daily monitoring the performance of film processor (whether automatic or manual) using the sensitometer & densitometer b) evaluated the significance and contribution of quality control in routine monitoring of performance of 3 types of automatic film processors & c) used the processer status to guide the exposure. Our experience with 750 evaluations is presented. The results show that the frequency of intervention in adjusting the temperature of automatic film processor was 22% and that of the adjustment of exposure 15%. This highlights the utility and necessity of routine quality control on day-to-day basis even for automatic film processors.
[ABSTRACT]   Full text not available  [PDF]
  479 120 -
Comparison Of Linear Quadratic Model With NSD Concept For Head And Neck Cancers
S.S Supe, A.C Deka
January-March 1990, 15(1):20-29
The NSD Concept was modified to TDF and TSD for normal tissues and tumour regressions respectively. However these concepts were empirical and TDF was not accurately applicable to late effects of normal tissues. Recent linear quadratic model predicts not only early and late reactions of normal tissues but also tumour control. Late stages of cancers of head and neck were treated with either 2.0, 2.17 or 2.2Gy per fraction five times a week for a total dose of 60, 65 and 55Gy respectively. The patients were inspected weekly by two radiotherapists independently to evaluate the normal tissue reactions and tumour regressions. ERD, for normal tissue reactions were evaluated for a/B = l0 and ERD, for tumour regressions with a/p=' 12Gy. The normal tissue reactions were plotted against ERD, and TDFs which show good fit to the data and confirm the value of sip = 10 and 12Gy and 100 TDF for the tolerance values. Tumour regressions Vs. ERD, and TSD data indicate the value of alp to be 12Gy.
[ABSTRACT]   Full text not available  [PDF]
  517 54 -
Common Physical Parameters Of Cancer Oesophagus A Study Of 1000 Cases
S.K Kaul, Rakesh Kaul, S.M Abbas, W.H Andrabi
January-March 1990, 15(1):48-52
Cancer oesphagus is the most common but the most lethal carcinoma found in this part of the country. About 46% of the cases planned for radiotherapy belong to this category. The most common physical parameter of these patients were recorded and studied. 15 cm x 8 cm is the most common field size and patient separation varies from 17 cm-20cm. The NSD varies from 1019 to 2116 rets without any complications. These results are useful for preparing the most appropriate data necessary for the planning of these patients. These can also be used by other developing centers which do not possess the facilities like simulator, isodose plotter, TPS etc. In the absence of the above equipment these results serve as a guide for the purpose of radiotherapy of patients which is expected to be close to correct dose delivery.
[ABSTRACT]   Full text not available  [PDF]
  478 38 -
Volume Analysis In The Treatment Of Carcinoma Of The Cervix With Radiation
T Ganesh, Sanjiv Sharma, Sandeep Singhal, R.C Joshi, Rajendra Kumar, G.K Rath
January-March 1990, 15(1):5-10
Intracavitary radiation therapy is an integral part of any radical radiation protocol in the management of the carcinoma of the cervix. In the present study, 142 patients of carcinoma of. the cervix (FIGO stage II and Ill), treated between June 1957 and August 1989 were selected. In all the patients intracavitary caesium application using the Selectron standard applicator was performed following initial external irradiation. A computerized dosimetry using Nucletron Planning System (NPS) was done in accordance with the ICRU 38 guidelines. The reference volume enclosed by the 60 G isodose level was calculated using the formula 3 HWT and also by Volume Dose Rate Table (VDRT) option available with the NPS. The calculation of reference volume by VDRT method is found to be more accurate compared to the 3 HWT method as the latter tends to underestimate the volume, since it is dependent on certain factors, especially poor source geometry, leading towards inaccuracy. This relationship however, needs further explanation to arrive at certain definitive conclusion.
[ABSTRACT]   Full text not available  [PDF]
  412 63 -
Investigation On The Thermoluminescence Of Irradiated Spices And Cereals For Their Identification
K.S Kirshnamurthy, P Sreeramakrishnan
January-March 1990, 15(1):63-72
The thermoluminescence property of Black pepper, Cardamom, Cloves, Coriander, Chilli Powder, Garam masala, Cumin seed, Mustard, Turmeric, Rice, and Wheat have been studied for doses upto 17.0 kGy. The decay of TL intensity with time of irradiated spices and cereals was followed for a period of six months. A measurable TL intensity was found to persist in a few spices beyond five months of their irradiation. The study indicates that the measurement of TL intensity of post irradiated samples of spices and cereals might form a simple and yet reliable basis for identifying the irradiated spices from unirradiated ones. Further studies on the aqualuminescence and chemiluminescence of these irradiated spices and cereals are also undertaken, which show promise for their identification in a few cases.
[ABSTRACT]   Full text not available  [PDF]
  409 63 -
Multifraction Treatments Of Head And Mock Cancers And Applicability Of CRE, TSD & ERDs (LO Model)
J.P Sharma, S.J Supe
January-March 1990, 15(1):30-44
Bllis concept of NSD was developed into TDF&CRE for normal tissues and into TSD for cancer control for the conventional treatments of one fraction a day. Recently linear quadratic (LQ) model has been applied for not only to the late and early effects on normal tissues but also to the cancer control. In order to improve the efficacy of radiotherapy for advanced cases of cancer, multifraction treatments a day (MDF) have been tried and are found to be successful in most of the cases. Dale has extended the linear quadratic model to the multifraction treatments a day and derived equation for relative effectiveness (RE) for 2,3 and many fractions a day. However, the variables of. < /P and p are not known for various tissues. Supe et al. have attempted to derive formulations for CRE and TSD for multifraction treatments a day. In order to test the applicability of these concepts to multifraction treatments a day, prospective studies were undertaken at Gandhi Medical College Hospital, Bhopal on patients of cancer of head Et neck region. . The data about normal tissue reactions and the tumour regressions fitted well with the values of CRE and TSD respectively. Taking values of o< /P as 10 Gy for normal tissue early effects as well 6s tumour regressions and P = .32h-' the LQ model also predicts better curability of tumour by MDF.
[ABSTRACT]   Full text not available  [PDF]
  426 45 -
Tissue Compensation With Aluminium For Co-60 Therapy
S.S Kantak, S Savithri, N.G Huilgol, H.N Trivedi, Bobalan
January-March 1990, 15(1):45-47
Full text not available  [PDF]
  280 60 -
Study Of Isodose Distribution And Volume Analysis Around BARC Manual Afterloading Applicator Using TSG-Radplan Treatment Planning System
V.K Sharma, S.L Kapoor
January-March 1990, 15(1):11-19
Full text not available  [PDF]
  274 54 -
Highlights Of XIth Conference On Medical Physics November 10-12, 1989 At Gwalior.
R.K. Kher
January-March 1990, 15(1):73-78
Full text not available  [PDF]
  235 50 -
Letter To The Editor
V.K Kalia
January-March 1990, 15(1):83-83
Full text not available  [PDF]
  210 29 -
 
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