3D Surface Realignment Tracking for Medical Imaging: A Phantom Study with PET Motion Correction
We present a complete system for motion correction in high resolution brain positron emission tomography (PET) imaging. The system is based on a compact structured light scanner mounted above the patient tunnel of the Siemens High Resolution Research Tomograph (HRRT) PET brain scanner. The structured light system is equipped with a near infrared diode and uses phase-shift interferometry (PSI) to compute 3D point clouds of the forehead of the patient. These 3D point clouds are progressively aligned to a reference surface, thereby giving the head pose changes. The estimated pose changes are used to reposition a sequence of reconstructed PET frames. To align the structured light system with the PET coordinate system, a novel registration algorithm based on the PET transmission scan and an initial surface has been developed. The performance of the complete setup has been evaluated using a custom-made phantom, based on a plastic mannequin head equipped with two positron-emitting line sources. Two experiments were performed. The first simulates rapid and short head movements, while the second simulates slow and continuous movements. In both cases, the system was able to produce PET scans with focused PET reconstructions. The system is nearly ready for clinical testing.
KeywordsPositron Emission Tomography Line Source Motion Correction Positron Emission Tomography Data Positron Emission Tomography Brain
The John and Birthe Meyer Foundation is thanked for the generous donation of the HRRT PET scanner and the cyclotrons for isotope production.
- 2.Gonzalez RC, Woods RE (2002) Digital image processing. Prentice Hall, New York Google Scholar
- 3.Green MV, Seidel J, Stein SD, Tedder TE, Kempner KM, Kertzman C, Zeffiro TA (1994) Head movement in normal subjects during simulated PET brain imaging with and without head restraint. J Nucl Med 35(9):1538–1546 Google Scholar
- 12.Rahmim A, Dinelle K, Cheng JC, Shilov MA, Segars WP, Lidstone SC, Blinder S, Rousset OG, Vajihollahi H, Tsui B, Wong DF, Sossi V (2008) Accurate event-driven motion compensation in high-resolution PET incorporating scattered and random events. IEEE Trans Med Imaging 27(8):1018–1033 CrossRefGoogle Scholar