13 - Prostate Implant LDR

13 - Prostate Implant LDR - Lecture # 13 (Ch. 23) Prostate...

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Prostate Implant Tarun K. Podder, PhD, DABR Department of Radiation Oncology Brody School of Medicine Leo Jenkins Cancer Center East Carolina University February 24, 2011 Lecture # 13 (Ch. 23)
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2 Prostate Implant LDR – prostate seed implant (PSI) Permanent implant, seeds remain in patient for ever HDR Temporary implant, radioactive source is withdrawn after treatment
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Seed Implant schematic 3
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2. Palladium 103: 120-125Gy Pd -103 Half Life = 17 days, dose rate about 2.5 times larger than for I-125 Energy = 21 keV HVL ~ 0.004mm Pb Decays by electron capture Isotopes in use 1. Iodine 125: 145-150Gy I-12 Half Life = 59.4 days Energy = 28 keV HVL ~ 0.025mm Pb Decays by electron capture 3. Cesium 131: 115-120Gy I-12 Half Life = 9.7 days Energy = 30 keV HVL ~ 0.03mm Pb Decays by electron capture 4
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Seed Design 5
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A typical implant (I-125) • Deliver 145 Gy to entire prostate gland • Approximately 50~100 seeds in 20 ~ 30 needles • Needles are guided by ultrasound and a template grid • Pre-planned needle positions to give even
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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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13 - Prostate Implant LDR - Lecture # 13 (Ch. 23) Prostate...

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