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Using vascular structure for CT-SPECT registration in the pelvis.
R J Hamilton1, M J Blend, C A Pelizzari
1Department of Radiation and Cellular Oncology, University of Chicago, Illinois, USA.
Summary
A new method accurately registers pelvic CT and SPECT images using blood vessel segmentation. This improves prostate cancer detection and aids in conformal radiation therapy planning.
Area of Science:
- Medical Imaging
- Radiology
- Nuclear Medicine
Background:
- Accurate 3D registration of pelvic CT and SPECT images is crucial for effective diagnosis and treatment planning.
- Existing methods may have limitations in precise anatomical correlation.
Purpose of the Study:
- To outline a novel method for 3D registration of pelvic CT and 111In-labeled capromab pendetide (111In MoAb 7E11.C5) SPECT images.
- To utilize 99mTc-labeled red blood cell SPECT data for enhanced registration accuracy.
Main Methods:
- CT-SPECT registration based on identifying and segmenting major blood vessels in both CT and 99mTc SPECT images.
- 3D vascular structure reconstruction from segmented outlines.
- Registration achieved by matching segmented vascular surfaces and applying transformations from SPECT-CT registration.
Main Results:
- Accurate registration of pelvic structures was achieved.
- Interpretation of 111In MoAb 7E11.C5 exams was significantly improved.
- Correlation of prostate cancer involvement sites with CT-defined bony and soft tissue anatomy was enhanced.
Conclusions:
- The described method serves as a general clinical tool for pelvic CT and SPECT image registration.
- Immediate applications include conformal radiation therapy planning for prostate cancer patients.