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Evaluating target cold spots by the use of tail EUDs
Thomas Bortfeld1, David Craft, James F Dempsey
1Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA. tbortfeld@partners.org
Summary
A new measure called tail equivalent uniform dose (EUD) effectively identifies underdosed areas in radiotherapy. This tail EUD aids in evaluating and optimizing radiation therapy dose distributions for better treatment outcomes.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiotherapy
Background:
- Radiotherapy dose distributions require precise evaluation and optimization.
- Existing methods for assessing target coverage may not fully capture underdosed regions.
Purpose of the Study:
- To introduce a novel metric, tail equivalent uniform dose (EUD), for quantifying target underdose in radiotherapy.
- To evaluate the utility of tail EUD in radiotherapy plan assessment and optimization.
Main Methods:
- Compared various equivalent uniform dose (EUD) formulations.
- Introduced and investigated the mathematical properties of tail EUD, a modification of EUD.
- Applied tail EUD retrospectively to intensity modulated radiation therapy (IMRT) plans.
- Utilized tail EUD as an optimization objective for prostate, pancreas, and head-and-neck plans.
Main Results:
- Tail EUD exhibits favorable mathematical properties, including convexity.
- Tail EUD correlates with subjective assessments of target coverage.
- Optimizing plans using tail EUD constraints resulted in comparable target coverage across different sites.
Conclusions:
- Tail EUD is a valuable tool for evaluating and optimizing radiotherapy dose distributions.
- The tail EUD metric shows potential for application in designing new clinical protocols.
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