Manuela Matesan1, Santhosh Gaddikeri2, Katelan Longfellow3, Robert Miyaoka1, Saeed Elojeimy1,4, Shana Elman1, Shu-Ching Hu5, Satoshi Minoshima6, David Lewis1. 1. Department of Radiology, University of Washington, Seattle, WA. 2. Department of Diagnostic Radiology and Nuclear Medicine at Rush University Medical Center, Chicago, IL. 3. CHI Franciscan Health, Tacoma, WA. 4. University of New Mexico, Albuquerque, NM. 5. Department of Neurology, University of Washington, Seattle, WA. 6. Department of Radiology, University of Utah, Salt Lake City, UT.
Abstract
BACKGROUND AND PURPOSE: Computer-based analysis of Dopamine transporter imaging (DaTscan) can aid in image interpretation. In this study, we examined the distribution of putamen-to-caudate ratios (PCRs) obtained by using a clinically available semiquantification method. METHODS: Medical records of 32 patients (M:16) with a diagnosis of Parkinson's disease (PD) (n = 22) or Parkinson's plus syndromes (PPS) (n = 10) based on clinical follow-up, were retrospectively reviewed. Single photon emission tomography (SPECT) imaging was performed 4 hours after intravenous injection of 3-5 mCi [I-123]-ioflupane. Semiquantitative evaluation using DaTQUANT software was performed. Utility of PCR with a cutoff of .7 and .8 in the diagnosis of nigrostriatal degeneration was assessed. PD and PPS groups based on clinical assessment and caudate-to-background ratio (CBR) were assessed separately. RESULTS: Minimum PCR for both hemispheres was .74 ± .09 (Mean ± SD, range: .58-.89), with 65.63% patients (21/32) having PCR > .7. Mean PCR in mild nigrostriatal degeneration was .77 ± .08 (range: .62-.89) and in advanced nigrostriatal degeneration was .73 ± .09 (range: .58-.89). Mean PCR in PD group was .73 ± .09 (range: .58-.89) and in PPS group was .75 ± .10 (range: .61-.88). CONCLUSIONS: Although PCR can intrinsically be a useful indication of disease, this ratio obtained in our analysis by using one of the clinically available automatic semiquantitative methods has large variability and might not be a reliable numeric marker in interpretation of [I-123]ioflupane studies. This may be due to difficulty in separating caudate from putamen on SPECT images, as well as the nonuniform decreased Ioflupane uptake in both putamen and caudate.
BACKGROUND AND PURPOSE: Computer-based analysis of Dopamine transporter imaging (DaTscan) can aid in image interpretation. In this study, we examined the distribution of putamen-to-caudate ratios (PCRs) obtained by using a clinically available semiquantification method. METHODS: Medical records of 32 patients (M:16) with a diagnosis of Parkinson's disease (PD) (n = 22) or Parkinson's plus syndromes (PPS) (n = 10) based on clinical follow-up, were retrospectively reviewed. Single photon emission tomography (SPECT) imaging was performed 4 hours after intravenous injection of 3-5 mCi [I-123]-ioflupane. Semiquantitative evaluation using DaTQUANT software was performed. Utility of PCR with a cutoff of .7 and .8 in the diagnosis of nigrostriatal degeneration was assessed. PD and PPS groups based on clinical assessment and caudate-to-background ratio (CBR) were assessed separately. RESULTS: Minimum PCR for both hemispheres was .74 ± .09 (Mean ± SD, range: .58-.89), with 65.63% patients (21/32) having PCR > .7. Mean PCR in mild nigrostriatal degeneration was .77 ± .08 (range: .62-.89) and in advanced nigrostriatal degeneration was .73 ± .09 (range: .58-.89). Mean PCR in PD group was .73 ± .09 (range: .58-.89) and in PPS group was .75 ± .10 (range: .61-.88). CONCLUSIONS: Although PCR can intrinsically be a useful indication of disease, this ratio obtained in our analysis by using one of the clinically available automatic semiquantitative methods has large variability and might not be a reliable numeric marker in interpretation of [I-123]ioflupane studies. This may be due to difficulty in separating caudate from putamen on SPECT images, as well as the nonuniform decreased Ioflupane uptake in both putamen and caudate.
Authors: Arnoldo Piccardo; Roberto Cappuccio; Gianluca Bottoni; Diego Cecchin; Luca Mazzella; Alessio Cirone; Sergio Righi; Martina Ugolini; Pietro Bianchi; Pietro Bertolaccini; Elena Lorenzini; Michela Massollo; Antonio Castaldi; Francesco Fiz; Laura Strada; Angelina Cistaro; Massimo Del Sette Journal: Eur Radiol Date: 2021-03-08 Impact factor: 5.315
Authors: Silvia Morbelli; Giuseppe Esposito; Javier Arbizu; Henryk Barthel; Ronald Boellaard; Nico I Bohnen; David J Brooks; Jacques Darcourt; John C Dickson; David Douglas; Alexander Drzezga; Jacob Dubroff; Ozgul Ekmekcioglu; Valentina Garibotto; Peter Herscovitch; Phillip Kuo; Adriaan Lammertsma; Sabina Pappata; Iván Peñuelas; John Seibyl; Franck Semah; Livia Tossici-Bolt; Elsmarieke Van de Giessen; Koen Van Laere; Andrea Varrone; Michele Wanner; George Zubal; Ian Law Journal: Eur J Nucl Med Mol Imaging Date: 2020-05-09 Impact factor: 9.236