Inclusion of quasi-vertex views in a brain-dedicated multi-pinhole SPECT system for improved imaging performance
Authors
Auer, BenjaminZeraatkar, Navid
Goding, Justin C.
Konik, Arda
Fromme, Timothy J.
Kalluri, Kesava S.
Furenlid, Lars R.
Kuo, Phillip H.
King, Michael A.
UMass Chan Affiliations
Department of RadiologyDocument Type
Accepted ManuscriptPublication Date
2020-10-16Keywords
Brain SPECTI-labeled tracers
AdaptiSPECT-C
Brain SPECT
image quality assessment
multi-pinhole
vertex and quasi-vertex view
Analytical, Diagnostic and Therapeutic Techniques and Equipment
Bioimaging and Biomedical Optics
Physics
Radiology
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Show full item recordAbstract
With brain-dedicated multi-detector systems employing pinhole apertures the usage of detectors facing the top of the patient's head (i.e., quasi-vertex views) can provide the advantage of additional viewing from close to the brain for improved detector coverage. In this paper, we report the results of simulation and reconstruction studies to investigate the impact of the quasi-vertex views on the imaging performance of AdaptiSPECT-C, a brain-dedicated stationary SPECT system under development. In this design, both primary and scatter photons from regions located inferior to the brain can contribute to SPECT projections acquired by the quasi-vertex views, and thus degrade AdaptiSPECT-C imaging performance. In this work, we determined the proportion, origin, and nature (i.e., primary, scatter, and multiple-scatter) of counts emitted from structures within the head and throughout the body contributing to projections from the different AdaptiSPECT-C detector rings, as well as from a true vertex view detector. We simulated phantoms used to assess different aspects of image quality (i.e., uniform sphere and Derenzo), as well as anthropomorphic phantoms with multiple count levels emulating clinical(123)I activity distributions (i.e., DaTscan and perfusion). We determined that attenuation and scatter in the patient's body greatly diminish the probability of the photons emitted outside the volume of interest reaching to detectors and being recorded within the 15% photopeak energy window. In addition, we demonstrated that the inclusion of the residual of such counts in the system acquisition does not degrade visual interpretation or quantitative analysis. The addition of the quasi-vertex detectors increases volumetric sensitivity, angular sampling, and spatial resolution leading to significant enhancement in image quality, especially in the striato-thalamic and superior regions of the brain. Besides, the use of quasi-vertex detectors improves the recovery of clinically relevant metrics such as the striatal binding ratio and mean activity in selected cerebral structures.Source
Auer B, Zeraatkar N, Goding JC, Konik A, Fromme TJ, Kalluri K, Furenlid LR, Kuo PH, King MA. Inclusion of quasi-vertex views in a brain-dedicated multi-pinhole SPECT system for improved imaging performance. Phys Med Biol. 2020 Oct 16. doi: 10.1088/1361-6560/abc22e. Epub ahead of print. PMID: 33065564. Link to article on publisher's site
DOI
10.1088/1361-6560/abc22ePermanent Link to this Item
http://hdl.handle.net/20.500.14038/48481PubMed ID
33065564Related Resources
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© 2020 Institute of Physics and Engineering in Medicine. As the Version of Record of this article is going to be/has been published on a subscription basis, this Accepted Manuscript will be available for reuse under a CC BY-NC-ND 3.0 licence after a 12 month embargo period.Distribution License
http://creativecommons.org/licenses/by-nc-nd/3.0/ae974a485f413a2113503eed53cd6c53
10.1088/1361-6560/abc22e
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Except where otherwise noted, this item's license is described as © 2020 Institute of Physics and Engineering in Medicine. As the Version of Record of this article is going to be/has been published on a subscription basis, this Accepted Manuscript will be available for reuse under a CC BY-NC-ND 3.0 licence after a 12 month embargo period.