Long-term stability of a PTW 34070 large-area parallel ionization chamber in clinical proton scanning beams.

ABSTRACT:

Purpose

In the modeling of beam data for proton therapy planning systems, absolute dose measurements are performed utilizing a Bragg peak chamber (BPC), which is a parallel-plate ionization chamber. The long-term stability of the BPC is crucial for ensuring accurate absolute dose measurement. The study aims to assess the long-term stability of the BPC in clinical proton pencil beam scanning delivery.

Methods

The long-term stability evaluation focused on the BPC-Type 34070 (PTW Freiburg, Germany), utilizing clinical proton scanning beams from December 2022 to November 2023. Monthly investigations were conducted to evaluate the response and cross-calibration factor of the BPC and a reference chamber, employing the spread-out Bragg peak (SOBP) field. Additionally, assessments w

SUBMITTER: Yamanaka M 

PROVIDER: S-EPMC11633811 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature