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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Couch height-based patient setup for abdominal radiation therapy.

Shingo Ohira1, Yoshihiro Ueda2, Kinji Nishiyama3

  • 1Department of Radiation Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan; Department of Medical Physics and Engineering, Osaka University Graduate School of Medicine, Suita, Japan.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|November 11, 2015
PubMed
Summary
This summary is machine-generated.

The couch height-based patient setup method (CHPS) offers superior accuracy for abdominal radiation therapy compared to skin mark patient setup methods (SMPS). CHPS achieved smaller setup deviations and required narrower margins, enhancing patient positioning reproducibility.

Keywords:
Abdominal cancerCouchSetupSkin mark

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Techniques

Background:

  • Accurate patient positioning is critical for effective abdominal radiation therapy.
  • Traditional skin mark patient setup (SMPS) may introduce setup deviations.
  • Couch height-based patient setup (CHPS) is an alternative positioning method.

Purpose of the Study:

  • To compare the setup accuracy of SMPS and CHPS in abdominal radiation therapy.
  • To evaluate the impact of different setup methods on required margins.
  • To determine the reproducibility of CHPS for patient positioning.

Main Methods:

  • A comparative study involving 23 pancreatic cancer patients and 539 treatment sessions.
  • Setup deviations in the anterior-posterior (A-P) direction were measured for SMPS (with and without corrections) and CHPS.
  • Systematic (Σ) and random (σ) errors were calculated, and margins were determined using the Stroom formula.

Main Results:

  • CHPS demonstrated significantly lower A-P deviations (>5mm) compared to SMPS/NC (17%), SMPS/NAL (4%), and SMPS/eNAL (4%).
  • CHPS showed no increasing deviation trend over fractions, unlike SMPS/NC (30% of patients).
  • Required margins were smallest for CHPS (2.2mm) compared to SMPS/NC (6.7mm), SMPS/NAL (4.6mm), and SMPS/eNAL (3.1mm).

Conclusions:

  • CHPS is a more reproducible and accurate method for abdominal patient setup in radiation therapy.
  • The CHPS method allows for smaller setup margins, potentially reducing treatment toxicity.
  • Implementing CHPS can improve the precision of radiation delivery for abdominal malignancies.