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Das A, Sun A, Driscoll B, Vines D, Weiss J, Liu Z. PO-1263 Measurement of tumor hypoxia in patients with non-small cell lung cancer using PET with 18F-FAZA. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)03227-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lewis S, Hope A, Chan M, Weiss J, Raziee H, Bezjak A, Cho J, Sun A, Lok B, Raman S, Bissonnette J, Vines D, Giuliani M. FLT-PET/CT in Non-Small Cell Lung Cancer Treated With SBRT- A Pilot Study. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2021.10.170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Glicksman R, Metser U, Vines D, Chan R, Valliant J, Chung P, Gospodarowicz M, Bayley A, Catton C, Warde P, Helou J, Lalani N, Green D, Perlis N, Fleshner N, Hamilton R, Zlotta A, Finelli A, Jaffray D, Berlin A. Preliminary Results of a Two Stage Phase II Study of 18F-DCFPyL PET-MR for Enabling Oligometastases Ablative Therapy in Subclinical Prostate Cancer. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.1901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Raziee H, Hope A, Bezjak A, Sun A, Cho J, Bissonnette J, Vines D, Driscoll B, Giuliani M. P1.14-016 Assessing the Feasibility of FLT-PET for Evaluation of Non-Small Cell Lung Cancer (NSCLC) Treated with Stereotactic Body Radiotherapy (SBRT). J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Bissonnette J, Bezjak A, Becker N, Vines D, Sun A. Serial 4-Dimensional (4D) Computed Tomography/4D Positron Emission Tomography Imaging to Predict and Monitor Response for Locally Advanced Non-Small Cell Lung Cancer Radiation Therapy. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Yap M, Sun A, Higgins J, Marshall A, Becker N, Le L, Clarke K, Vines D, Bezjak A, Bissonnette J. Adaptive Dose-Escalation Using Serial 4D-PET/CT Scans During Radiation Therapy for Locally Advanced Non-Small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Aerts H, Dekker A, Lavoie C, Green S, Michielsen J, De Ruysscher D, Vines D, Sun A. Identification of Residual Metabolic-active Areas within Lung Tumors using a Pre-radiotherapy FDG-PET-CT Scan. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Markel D, Caldwell C, Sun A, Hamideh A, Vines D. Poster - Thur Eve - 49: Investigating the Effects of Motion on Texture within the Lung. Med Phys 2010. [DOI: 10.1118/1.3476154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Keller H, Lakshman M, Vines D, Dunne M, Bristow R. SU-DD-A2-04: Functional Relationships between Imaging and Biological Markers for the Purpose of Dose Painting Using the Example of FLT-PET and the Ki-67 Labeling Index. Med Phys 2010. [DOI: 10.1118/1.3467991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Keller H, Vines D, Lakshman M, Dunne M, Lindsay P, Green D, Clarkson R, Bristow R. 106 poster: Characterization of Flt-Pet Response to High- and Low-Dose Radiation of a Lung Cancer Xenograft in Mice. Radiother Oncol 2010. [DOI: 10.1016/s0167-8140(15)34525-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Shi C, Eom J, Vines D, De S, Xu G. Physics-based Patient-Specific Respiration Modeling for 4D Treatment Planning. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Eom J, De S, Xu X, Shi C, Vines D. SU-FF-T-177: Physics-Based Respiration Modeling for Radiation Treatment Using Patient-Specific PV Curves. Med Phys 2009. [DOI: 10.1118/1.3181652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Sun A, Lim G, Wysocka B, Vines D, Freeman M, Bezjak A, Cho J, Brade A, Hope A, Breen S. A Pilot Prospective Study of Metabolic and Anatomic Response using FDG PET CT before, during and after Radiotherapy in Lung Cancer. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Keller H, Tsang R, Goda J, Vines D, Breen S, Lockwood G. Quantification of Early, Intermediate and Late Volumetric and Metabolic Response during Fractionated Radiation Therapy for non-Hodgkin's Lymphoma. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Keller H, Tsang R, Vines D, Breen S, Lockwood G. Quantification of Local Tumor Response to Fractionated Radiation Therapy for Non-Hodgkin's Lymphoma Using Weekly 18F-FDG PET Imaging. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.1781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Keller H, Vines D, Breen S. SU-FF-J-115: Quantification of Uptake Volumes in PET Images for Treatment Response Monitoring: Challenges and Solutions. Med Phys 2007. [DOI: 10.1118/1.2760620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Keller H, Breen S, Vines D, Jaffray D. WE-D-ValB-02: Thresholding of PET Target Volumes for Treatment Planning and Response Monitoring: Measurement and Modelling Approaches. Med Phys 2006. [DOI: 10.1118/1.2241755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Tipre DN, Lu JQ, Fujita M, Ichise M, Vines D, Innis RB. Radiation dosimetry estimates for the PET serotonin transporter probe 11C-DASB determined from whole-body imaging in non-human primates. Nucl Med Commun 2004; 25:81-6. [PMID: 15061269 DOI: 10.1097/00006231-200401000-00012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The radiotracer 3-amino-4-(2-dimethylaminomethyl-phenylsulfanyl)-benzonitrile labelled in the N-methyl position (11C-DASB) is a selective radioligand for the in vivo quantification of serotonin transporters (SERTs) using positron emission tomography (PET). The current study quantified the distribution of activity in two rhesus monkeys after the injection of approximately 333 MBq (9 mCi) 11C-DASB. Whole-body images were acquired at 22 time points for a total of 120 min following injection of the radioligand. Source organs were identified at each time point from both tomographic images (using multiple regions of interest on each tomograph for each organ) and a single planar image (using a single region of interest for each organ). The peak activities in planar images in the five identified source organs (expressed as per cent injected dose (ID)) were lungs (24% ID at 1.5 min), kidneys (6.5% ID at 4 min), liver (8% ID at 3 min), brain (4% ID at 5 min) and spleen (0.42% ID at 3 min). Mono-exponential fitting of activity overlying the bladder suggested that approximately 14% of activity was excreted via the urine. The radiation burden to the body was calculated from residence times of these source organs and then scaled to corresponding human values. The calculated effective dose from tomographic and planar images was 6.0 and 6.4 microGy x MBq(-1) (22.3 and 23.7 mrad x mCi(-1)), respectively. The planar analysis was much easier to perform, and generally yielded slightly higher (i.e., more conservative) estimates of radiation burden than the tomographic analysis. The estimated radiation burden of 11C-DASB is relatively modest and would allow multiple scans per research subject per year.
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Affiliation(s)
- D N Tipre
- Molecular Imaging Branch, National Institute of Mental Health, Bethesda, Maryland 20892-0135, USA.
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Tanaka F, Vines D, Tsuchida T, Freedman M, Ichise M. Normal patterns on 99mTc-ECD brain SPECT scans in adults. J Nucl Med 2000; 41:1456-64. [PMID: 10994723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
UNLABELLED Normative ethyl cysteinate dimer (ECD) SPECT data must be available to successfully apply ECD SPECT to clinical studies. The purpose of this study was to determine ECD SPECT scan patterns of healthy adults. METHODS Forty-eight healthy volunteers (22 men, 26 women; age range, 22-95 y; mean age, 47.6 +/- 19.2 y) underwent high-resolution ECD SPECT. For visual analysis of regional brain ECD uptake, we used a scale of +3 to -3, in which +3 and -3 indicated highest ECD uptake and deficit, respectively. For quantitative analysis, we measured the region-to-cerebellum ratio (R/CE) and the region-to-cerebral cortex ratio (R/CO) for 17 regions (13 cortical, 3 subcortical, and 1 cerebellar). RESULTS On visual analysis, no subject had a score of -3. All subjects had a score of -2 for the hippocampus and a score of +3 for the medial occipital cortex, except for 2 subjects who had a score of +3 for the striatum and thalamus. A frontal eye field and posterior parieto-occipital junction were identified in 60% of subjects with a score of +1 and 79% of subjects with a score of +2. On quantitative analysis, a significant regional variation (ANOVA, P < 0.0001) was seen in R/CE, ranging from 0.709 (hippocampus) to 1.26 (medial occipital cortex). However, regional right-to-left differences and intersubject variability of R/CE were small (asymmetry index, 3.6% +/- 0.8%; coefficient variation, 6.6% +/- 0.7%). R/CE declined significantly with age in 6 regions, including the anterior and posterior cingulate cortex, superior prefrontal and parietal cortex, striatum, and hippocampus (1.0%-2.0% per decade, P < 0.05), whereas R/CO in the cerebellum increased significantly with age (1.0% per decade, P < 0.05). CONCLUSION Although regional ECD brain perfusion patterns vary significantly, including variability caused by the age-related effect, intersubject variability is small. Recognition of these normal patterns is important for clinical interpretation of ECD SPECT studies.
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Affiliation(s)
- F Tanaka
- Department of Medical Imaging, University of Toronto, Ontario, Canada
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Ichise M, Kim YJ, Ballinger JR, Vines D, Erami SS, Tanaka F, Lang AE. SPECT imaging of pre- and postsynaptic dopaminergic alterations in L-dopa-untreated PD. Neurology 1999; 52:1206-14. [PMID: 10214745 DOI: 10.1212/wnl.52.6.1206] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND In PD, presynaptic dopamine transporters are known to be decreased, whereas postsynaptic striatal D2 receptors are proposed to be upregulated. However, the relationship between these alterations is not clear. OBJECTIVE To evaluate the ability of SPECT to detect both the pre- and postsynaptic dopaminergic alterations of the striatum in patients with L-dopa-untreated PD. METHODS We studied 10 L-dopa-untreated patients with clinically mild PD and 21 age-matched normal controls. Individuals had both presynaptic [123I]beta-CIT dopamine transporter and postsynaptic [123I]IBF D2 SPECT studies 1 week apart. RESULTS In PD patients, the dopamine transporter binding potential Rv ipsilateral/contralateral to the most affected limbs was 30%/41%, 41%/50%, and 59%/68% lower than controls for caudate, anterior putamen, and posterior putamen, respectively. These bilateral Rv decreases showed a lateralized difference more reduced in the contralateral striatum as well as intrastriatal differences most reduced in the posterior putamen. In contrast, in PD patients the D2 binding potential Rv ipsilateral/contralateral was 15%/16% higher for caudate, 18%/14% higher for anterior putamen, and 28%/31% higher for posterior putamen. These bilateral Rv increases showed no lateralized differences and less marked intrastriatal differences. The motor Unified Parkinson's Disease Rating Scale scores negatively correlated with dopamine transporter Rv but not with D2 Rv. CONCLUSIONS SPECT imaging can detect characteristic dopaminergic alterations in the striatum of dopa-untreated PD patients including the upregulation of postsynaptic D2 receptors (denervation supersensitivity). SPECT is widely available and is a promising clinical tool to evaluate PD patients.
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Affiliation(s)
- M Ichise
- Division of Nuclear Medicine, Mount Sinai Hospital Site of University Medical Imaging Center, University of Toronto, Ontario, Canada
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Ichise M, Kim YJ, Erami SS, Ballinger JR, Vines D, Tanaka F, Lang AE. Functional morphometry of the striatum in Parkinson's disease on three-dimensional surface display of 123I-beta-CIT SPECT data. J Nucl Med 1999; 40:530-8. [PMID: 10210210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Abstract
UNLABELLED The purpose of this study was to evaluate whether striatal morphology on a three-dimensional surface display of 123I-2beta-carbomethoxy-3beta-(4-iodophenyl)tropane (123I-beta-CIT) SPECT data can be used as a diagnostic index for Parkinson's disease. METHODS We studied 11 patients with mild Parkinson's disease and 21 age-matched controls. Triple-head SPECT scans were acquired for 30 min at 20 h after injection of 123I-beta-CIT. We measured the vertical height of the caudate head (H) and the length of the long axis of the striatum (L) on the three-dimensional surface display generated from SPECT data. The morphometric index of the striatum was defined as L/H. The power of L/H to discriminate Parkinson's disease and control groups was evaluated by discriminant function analysis and was compared with that of region of interest (ROI)-based 123I-beta-CIT binding measurements (V"3) and their ratios. RESULTS The mean L/H ratios (ipsilateral/contralateral) to the most affected limbs were (33%/45%) lower in the Parkinson's disease group compared with the control group, respectively. All other ROI-based measures confirmed that dopamine transporter reductions were most severe in the contralateral posterior putamen (a 68% reduction in V"3). In 1 patient with a subsequent clinical diagnosis of drug-induced parkinsonism, all SPECT measures were normal. The contralateral putamen contributed most to the discriminatory power, and the contralateral L/H showed the best discriminatory power of all SPECT measures. CONCLUSION These results suggest that striatal morphology on a three-dimensional display of 123I-beta-CIT SPECT data provides information of diagnostic significance for Parkinson's disease. This morphometry can be done without requiring technically demanding ROI analysis, and thus this technique may be suitable for routine clinical use.
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Affiliation(s)
- M Ichise
- Department of Medical Imaging, Mount Sinai Hospital, Toronto, Ontario, Canada
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Abstract
A tripeptidyl aminopeptidase I with an M(r) of 47,000 Da has been purified from rat spleen. The N-terminal sequence of the enzyme and internal sequences did not resemble that of any known protein. The enzyme cleaves tripeptides from synthetic substrates provided that the N-terminus is unsubstituted and the amino acid in the P1 position is not charged. The enzyme also cleaves small peptides (angiotensin II and glucagon) releasing tripeptides but does not appear to demonstrate any preference for amino acids on either side of the cleavage site. The enzyme had maximum activity at pH 4 but was unstable above pH 7. Rat spleen tripeptidyl peptidase I was not inhibited by classical inhibitors of serine, cysteine, aspartate or metalloproteinases. The peptidase was potently inhibited by a series of substrate-based tripeptidyl chloromethyl ketones (Ki's of 10(-6)-10(-8) M). Inhibition was rapid and reversible. This mode of inhibition is different to the interaction between chloromethyl ketones and cysteine or serine peptidases. These tripeptidyl chloromethyl ketones were also inhibitors of bone resorption using an in vitro assay suggesting that a tripeptidyl peptidase is involved in the degradation of bone matrix proteins.
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Affiliation(s)
- D Vines
- Department of Histopathology, St George's Hospital Medical School, London, UK
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Vines D, Denhartog P, Kwan D, Ichise M. Off-site determinations of effective renal plasma flow using technetium-99m-MAG3 and single blood sampling. J Nucl Med Technol 1998; 26:23-5. [PMID: 9549688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
UNLABELLED This study evaluated the feasibility of determining effective renal plasma flow (ERPF) at an off-site central laboratory by transferring blood samples from the on-site laboratory. METHODS Blood samples were obtained from 66 patients referred for renal imaging with 99mTc-MAG3. ERPF values were determined using the single blood sample method (BSM) at both on- and off-site laboratories. The ERPF values were classified clinically as normal or abnormal. Both the ERPF values and clinical classification were compared between on- and off-site laboratories. RESULTS The off-site ERPF overestimated those on-site by 2.8% (paired Student's t-test p < 10(-5)). However, off-site ERPF values highly correlated with the values obtained on-site (r = 0.99; p < 10(-5)). In addition, the clinical classification for each patient determined at each site was identical. CONCLUSION ERPF can be determined accurately off-site. This method should allow many nuclear medicine departments access to the ERPF determination by the BSM at a central off-site laboratory.
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Affiliation(s)
- D Vines
- Department of Nuclear Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada
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Vines D, Warburton MJ. Inhibition of bone resorption by inhibitors of tripeptidyl peptidase-I. Biochem Soc Trans 1997; 25:S615. [PMID: 9450043 DOI: 10.1042/bst025s615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- D Vines
- Department of Histopathology, St George's Hospital Medical School, London
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Ichise M, Golan H, Ballinger JR, Vines D, Blackman A, Moldofsky H. Regional differences in technetium-99m-ECD clearance on brain SPECT in healthy subjects. J Nucl Med 1997; 38:1253-60. [PMID: 9255160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
UNLABELLED The aim of this study was to evaluate the in vivo stability of ECD brain SPECT. METHODS Twenty normal volunteers (35.4 +/- 9.1 yr) each had six ECD scans at 30, 60, 120, 240, 360 and 480 min postinjection. Each scan was acquired for 24 min using a triple-head SPECT system. Average counts per pixel were measured from frontal, temporal, parietal, occipital, cerebellum, basal ganglia, thalamus and white matter regions. ECD clearance rates were calculated by fitting regional time activity data to a monoexponential equation. Regional gray-to-white matter (G/W) and gray-to-cerebellum (G/C) ratios were calculated for each scan. Analysis of variance was used to compare regional ECD clearance and ratio measurements. RESULTS The average ECD clearance was 4.3%/hr. There was a significant regional variation in the ECD clearance, being higher for occipital (6.34%/hr) but lower for both white matter (2.39%/hr) and thalamus (2.45%/hr). Both G/W and G/C ratios showed a significant regional variation with time. The overall G/W ratio was 2.13 at 30 min and became progressively lower after 2 hr, reaching 1.78 at 8 hr. All regional G/W ratios declined with time except for thalamus where it remained constant at 2.15. The overall G/C ratio was 0.984 at 30 min but it declined after 4 hr, reaching 0.955 at 8 hr. All regional G/C ratios declined with time except for thalamus where it increased progressively from 0.955 to 1.120 at 8 hr. CONCLUSION ECD clears from normal brain slowly and shows a significant regional variation. As a result, G/W contrast begins to decrease after 2 hr and the gray-matter activity pattern becomes significantly different after 4 hr. Therefore, the optimal imaging time may be between 30-120 min. However, images obtained up to 4 hr still maintain the initial gray-matter activity pattern.
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Affiliation(s)
- M Ichise
- Department of Nuclear Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada
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Ichise M, Ballinger JR, Vines D, Tsai S, Kung HF. Simplified quantification and reproducibility studies of dopamine D2-receptor binding with iodine-123-IBF SPECT in healthy subjects. J Nucl Med 1997; 38:31-7. [PMID: 8998145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
UNLABELLED The purpose of this study was to assess the feasibility of a simplified SPECT scan protocol to quantify D2-receptor binding using [123I]iodobenzofuran (IBF) and to evaluate reproducibility of quantitative IBF-SPECT imaging without blood data. METHODS Twenty healthy volunteers participated in the study, six had test/retest studies separated by 1 wk. Scans were acquired every 5 min for 180 min using a triple-headed SPECT camera after a bolus injection of IBF (292 MBq). The receptor parameter was determined by using our previously proposed variation of graphical analysis that derives the distribution volume ratio (Rv = V3/V2) from multiple scan data without blood data. Rv' was determined from three 20-min scan data obtained at 0-20, 50-70 and 160-180 min postinjection and compared with Rv as determined from scans obtained at 0-180 min. RESULTS The mean Rv' (2.93 +/- 0.59) underestimated the mean Rv (3.10 +/- 0.50) by 5%. The mean variability (mean percent absolute difference) between Rv' and Rv was low (10%) with excellent reliability (intraclass correlation coefficient, p = 0.90). The relationship between Rv' and Rv was linear (r = 0.95, p < 10(-5)). The mean test/retest Rv and mean test/retest Rv' were (3.19 +/- 0.70/3.18 +/- 0.80) and (3.16 +/- 0.81/3.01 +/- 0.94), respectively, and these measures were not significantly different between test/retest studies. The mean test/retest variability of Rv was low (5%) with excellent reliability (p = 0.98). In addition, the mean test/retest variability of Rv' was low (10%) with excellent reliability (p = 0.94). CONCLUSION Three short (20 min) IBF-SPECT scans allowing for rest periods between scans permit reliable measurements of the dopamine D2-receptor parameter V3/V2. Quantitative IBF-SPECT imaging without blood data is reliable and reproducible.
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Affiliation(s)
- M Ichise
- Department of Nuclear Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada
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Ichise M, Ballinger JR, Golan H, Vines D, Luong A, Tsai S, Kung HF. Noninvasive quantification of dopamine D2 receptors with iodine-123-IBF SPECT. J Nucl Med 1996; 37:513-20. [PMID: 8772658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
UNLABELLED Iodine-123-iodobenzofuran (IBF) is a potent dopamine D2 receptor ligand suited for quantitative receptor studies. The purpose of this study was to evaluate three noninvasive methods of estimating the receptor parameter k3/k4 in humans with IBF-SPECT. METHODS Scans were acquired every 5 min for 180 min using a triple-headed SPECT system following a bolus injection of IBF (296 +/- 37 MBq) in 14 normal volunteers. k3/k4 was estimated by the peak equilibrium ratio (RPE) method and two proposed methods: a variation of the graphic method that derives the ratio of ligand distribution volumes (RV) and area ratio (RA) method, in which the ratio is calculated from the areas under the specific binding and nondisplaceable activity curves. RESULTS The mean RPE, RV and RA were 2.74 +/- 0.40, 3.06 +/- 0.42 and 2.26 +/- 0.28, respectively. Both RPE and RA underestimated RV. The relationship between RPE or RA and RV was linear (p < or = 10(-5), RA showed higher correlation (r = 0.94) with RV than did RPE (r = 0.90). Simulations based on a tracer kinetic model showed that RV, unlike RPE or RA, is affected by neither regional cerebral blood flow (rCBF) nor peripheral clearance rate (CR) of IBF. All three measures showed a significant decline with increasing age (r = 0.54-0.58, p < 0.05). CONCLUSION RV is preferred because it provides a theoretically valid estimate of k3/k4, independently of rCBF or CR. Alternatively, RA might be preferred to RPE because the former is simpler than the latter to implement yet the former provides a measure that equally well correlates with k3/k4.
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Affiliation(s)
- M Ichise
- Department of Nuclear Medicine, Mount Sinai Hospital, Toronto, Ontario Canada
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