A nomogram to determine required seed air kerma strength in planar

Publication/Presentation Date

2-1-2019

Abstract

PURPOSE: Intraoperatively implanted Cesium-131 (

MATERIAL AND METHODS: TG-43U1 recommended parameters were used to create a point-source model in MATLAB. The dose delivered to the prescription point from a single 1 U seed at each possible location in the implant plane was calculated. Implant tables were verified using an independent seed model in MIM Symphony LDR™. Implant tables were used to retrospectively determine seed AKS for previous cases: three rectangular and three irregular.

RESULTS: For rectangular implants, the percent difference between required seed AKS calculated using MATLAB and MIM was at most 0.6%. For irregular implants, the percent difference between MATLAB and MIM calculations for individual seed locations was within 1.5% with outliers of less than 3.1% at two distal locations (10.6 cm and 8.8 cm), which have minimal dose contribution to the prescription point. The retrospectively determined AKS for patient implants using nomogram tables agreed with previous calculations within 5% for all six cases.

CONCLUSIONS: Nomogram tables were created to determine required AKS per seed for planar uniform AKS

Volume

11

Issue

1

First Page

91

Last Page

98

ISSN

1689-832X

Disciplines

Business Administration, Management, and Operations | Health and Medical Administration | Management Sciences and Quantitative Methods

PubMedID

30911315

Department(s)

Administration and Leadership

Document Type

Article

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