Journal of Medical Physics
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Year : 1998  |  Volume : 23  |  Issue : 4  |  Page : 277-282

Optimization Of Image Quality In Chest Radiography

Correspondence Address:
M.M Rehani

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Source of Support: None, Conflict of Interest: None

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The optimization of image quality has to include aspects dealing with "information content" in addition to physical parameters such as density, contrast, blur and sharpness. There is a need for development of criteria based on anatomical visualisation and diagnostic efficacy for better interpretation of the chest image. The work included design of proforma; one for scoring the image quality based on extent of visualisation of anatomical structures, and another for evaluating the diagnostic efficacy based on grading the information in different regions of interest. These criteria were used to compare the image quality of chest radiographs taken with conventional and high kV technique. 57 PA chest films taken by conventional technique (55-80 kVp, 20-40 mAs, 6 fl. distance) and 48 films of high kVp (125 kVp, 5 mAs, 10-12 ft. distance) were graded. In addition, comparison of films of 16 patients taken by both techniques was done. Using the grading proforma, the scores for high kV technique were found to be better than those for conventional technique (95 * 4% vs. 78 * 17%), which also depict lesser variability in image quality in high kV technique (smaller standard deviation). Three areas were found to have poor score in conventional technique, namely, trachea which had optimal score only in 35% cases, retrodiaphragmatic lung tissue in 34.7% and spine in 33.8% cases. The scores of these areas got increased to 86%, 64% and 59%, respectively, in high kV technique. This was achieved without compromising on scores of other areas. Criteria for evaluating the image quality and diagnostic efficacy been developed and utilised for evaluating and comparing the scores of chest radiography by conventional technique and high kV technique. The optimisation of weak areas depicted in conventional technique by high kV technique was demonstrated.

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