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Data-driven voluntary body motion detection and non-rigid event-by-event correction for static and dynamic PET.
- Source :
-
Physics in medicine and biology [Phys Med Biol] 2019 Mar 08; Vol. 64 (6), pp. 065002. Date of Electronic Publication: 2019 Mar 08. - Publication Year :
- 2019
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Abstract
- PET has the potential to perform absolute in vivo radiotracer quantitation. This potential can be compromised by voluntary body motion (BM), which degrades image resolution, alters apparent tracer uptakes, introduces CT-based attenuation correction mismatch artifacts and causes inaccurate parameter estimates in dynamic studies. Existing body motion correction (BMC) methods include frame-based image-registration (FIR) approaches and real-time motion tracking using external measurement devices. FIR does not correct for motion occurring within a pre-defined frame and the device-based method is generally not practical in routine clinical use, since it requires attaching a tracking device to the patient and additional device set up time. In this paper, we proposed a data-driven algorithm, centroid of distribution (COD), to detect BM. In this algorithm, the central coordinate of the time-of-flight (TOF) bin, which can be used as a reasonable surrogate for the annihilation point, is calculated for every event, and averaged over a certain time interval to generate a COD trace. We hypothesized that abrupt changes on the COD trace in lateral direction represent BMs. After detection, BM is estimated using non-rigid image registrations and corrected through list-mode reconstruction. The COD-based BMC approach was validated using a monkey study and was evaluated against FIR using four human and one dog studies with multiple tracers. The proposed approach successfully detected BMs and yielded superior correction results over conventional FIR approaches.
- Subjects :
- Animals
Dogs
Fluorodeoxyglucose F18
Haplorhini
Humans
Image Processing, Computer-Assisted methods
Positron-Emission Tomography methods
Algorithms
Monitoring, Physiologic
Movement
Organ Motion physiology
Positron-Emission Tomography standards
Respiration
Respiratory-Gated Imaging Techniques methods
Subjects
Details
- Language :
- English
- ISSN :
- 1361-6560
- Volume :
- 64
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Physics in medicine and biology
- Publication Type :
- Academic Journal
- Accession number :
- 30695768
- Full Text :
- https://doi.org/10.1088/1361-6560/ab02c2