08 - Treatment Planning II Patient Data and Setup

08 - Treatment Planning II Patient Data and Setup - Lecture...

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1 Treatment Planning II: Patient data, corrections, and setup Tarun K. Podder, PhD, DABR Department of Radiation Oncology Brody School of Medicine Leo Jenkins Cancer Center East Carolina University February 03, 2011 Lecture # 8 (Ch. 12)
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2 Acquisition of Patient Data Body Contours Internal Structures Imaging - CT - MR - US - PET-CT CT numbers plotted as a function of electron density relative to water. Contour plotter
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Treatment Verification Port Films (good practice, mandatory, legal record) Electronic Portal Imaging (mirror-based, fiber optics, liquid matrix, solid state detector) Video-based electronic portal imaging device DRR Port film
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4 Corrections for Contour Irregularities 1. Effective SSD Method 2. TAR or TMR Method 3. Isodose Shift Method
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5 Corrections for Contour Irregularities 1. Effective SSD Method Dose distribution under an irregular surface such as S–S. The solid isodose curves are from an isodose chart that assumes a flat surface located at S′–S′. The dashed isodose curves assume a flat surface at S″–S″ without any air gap.
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6 Corrections for Contour Irregularities 2. TAR or TMR Method T = TAR or TMR
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7 Corrections for Contour Irregularities 3. Isodose Shift Method k = f (beam quality, field size, depth, SSD) TAR/ TMR method is the most accurate.
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8 Example 1: For point A in the adjacent figure, h = 3 cm, d = 5 cm. Calculate dose at point A using (a) the effective SSD method, and (b) the TAR method.
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This note was uploaded on 01/21/2012 for the course PHYS 6720 taught by Professor Hu during the Spring '10 term at East Carolina University .

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08 - Treatment Planning II Patient Data and Setup - Lecture...

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