Registration of serial SPECT/CT images for three-dimensional dosimetry in radionuclide therapy.
- Medicinsk strålningsfysik, Lund
Publikation/Tidskrift/Serie: Physics in Medicine and Biology
Dokumenttyp: Artikel i tidskrift
Förlag: IOP Publishing
For radionuclide therapy, individual patient pharmacokinetics can be measured in three dimensions by sequential SPECT imaging. Accurate registration of the time series of images is central for voxel-based calculations of the residence time and absorbed dose. In this work, rigid and non-rigid methods are evaluated for registration of 6-7 SPECT/CT images acquired over a week, in anatomical regions from the head-and-neck region down to the pelvis. A method for calculation of the absorbed dose, including a voxel mass determination from the CT images, is also described. Registration of the SPECT/CT images is based on a CT-derived spatial transformation. Evaluation is focused on the CT registration accuracy, and on its impact on values of residence time and absorbed dose. According to the CT evaluation, the non-rigid method produces a more accurate registration than the rigid one. For images of the residence time and absorbed dose, registration produces a sharpening of the images. For volumes-of-interest, the differences between rigid and non-rigid results are generally small. However, the non-rigid method is more consistent for regions where non-rigid patient movements are likely, such as in the head-neck-shoulder region.
- Radiology, Nuclear Medicine and Medical Imaging
- ISSN: 1361-6560
E-post: michael [dot] ljungberg [at] med [dot] lu [dot] se