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A simple algorithm to assess patient suitability for Calypso-seed implantation for four-dimensional prostate
Randall J Kimple1, Eric M Wallen, Raj Pruthi
1Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7512, USA. rkimple@unch.unc.edu
Journal of Applied Clinical Medical Physics
|February 18, 2010
Summary
Most prostate cancer patients are candidates for Calypso localization. Body measurements like weight and BMI, not just surface anatomy, accurately predict eligibility for this prostate cancer treatment.
Area of Science:
- Urology
- Medical Physics
- Oncology
Background:
- Prostate localization is crucial for effective prostate cancer treatment.
- The Calypso system offers advanced localization capabilities.
- Accurate patient selection is key to maximizing the benefits of Calypso localization.
Purpose of the Study:
- To determine the proportion of prostate cancer patients suitable for Calypso localization.
- To evaluate the accuracy of surface anatomy in predicting prostate depth.
- To develop a clinical algorithm for predicting Calypso appropriateness.
Main Methods:
- Retrospective review of medical records and CT scans (2006-2007).
- Analysis of anatomical factors, prostate depth, and Calypso feasibility.
- Statistical methods included ANOVA, linear regression, and ROC analysis.
Main Results:
- 91% of patients were appropriate for Calypso (52% localize and track, 39% localize only).
- Greater trochanter location showed strong correlation with prostate depth (r²=0.91), but underestimated eligibility.
- Weight, BMI, and waist/hip circumference correlated with prostate depth and predicted Calypso appropriateness.
Conclusions:
- The Calypso system is suitable for the majority of prostate cancer patients.
- Surface anatomy measurements can underestimate patient eligibility for Calypso.
- Clinical factors like weight, BMI, and waist/hip circumference are valuable predictors for Calypso appropriateness.
