Indian Journal of Radiology Indian Journal of Radiology  

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Year : 2002  |  Volume : 12  |  Issue : 3  |  Page : 407-412
Rotational treatment planning versus conventional fixed field treatment planning for the treatment of carcinoma prostate : A CT based three dimensional planning


Dept of Radiotherapy, PGIMS, Rohtak-124 001, Haryana, India

Correspondence Address:
R Dhankhar
4/8 J, Medical Enclave, PGIMS,Rohtal 124 001
India
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Source of Support: None, Conflict of Interest: None


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Purpose: To compare CT based three-dimensional rotational (full and skip scan) treatment planning and conventional three-dimensional fixed field (four and six fields) planning in localized carcinoma prostate. Materials and Methods: Seven patients of localized carcinoma prostate were planned by different conformal rotational and fixed fields. All the plans were normalized to deliver 100 percent to the central axis and full 3D calculations were performed. Plan evaluation tools consisted of beam's eye view, multiplanar displays, isodose distribution, cumulative and differential dose volume histograms and OSCAR (Objective Scoring by Colored Areas of Regrets) software. Results: Analysis of dose volume histograms revealed that V95, D95, D05 and D95 for planning target volume (PTV) were comparatively higher when planned by skip scan technique than when planned by fixed field technique (91 percent, 91 percent, 90 percent and 91.4 percent versus 85 percent, 87 percent, 86 percent ad 88 percent). DVH analysis for organs at risk showed that V95, V50 and DM values for rectum and bladder obtained by skip-scan technique was lower than when planning was done by 4/6-field technique (1 percent, 70 percent ad 51 percent versus 13 percent, 91 percent and 55 percent for rectum and 4 percent, 25percent and 51 percent versus 16 percent, 38 percent and 56 percent for urinary bladder respectively). Full rotational technique was the best amongst all as far as doseto B/L femoral heads was concerned (0 percent, 0 percent and 29 percent versus 0 percent, 1 percent and 28 percent respectively)


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