Humans ; Pilot Projects ; Prospective Studies ; Pulmonary Emphysema/surgery* ; Lung/surgery* ; Emphysema ; Perfusion ; Tomography, Emission-Computed ; Tomography ; Tomography, Emission-Computed, Single-Photon ; Pneumonectomy ; Bronchoscopy/methods*

Objective: To investigate the diagnostic efficiency and incremental value of quantitative myocardial blood flow measurements by Cadmium-Zine-Telluride (CZT) single photon emission computed tomography (SPECT) dynamic myocardial perfusion imaging (MPI) in patients with coronary artery disease (CAD) compared with traditional semi-quantitative measurements by MPI. Methods: This is a retrospective, cross-sectional study. We retrospectively analyzed clinical data of patients with suspected or known CAD, who underwent the dynamic MPI quantitative blood flow measurement of CZT SPECT in TEDA International Cardiovascular Hospital from October 2018 to December 2020. Clinical data, semi-quantitative parameters (stress score (SS), rest score (RS) and different score (DS)) and myocardial quantitative blood flow parameters (rest myocardial blood flow (rMBF), stress myocardial blood flow (sMBF) and myocardial flow reserve (MFR)) were analyzed. According to the results of coronary angiography, patients were divided into the stenosis group and the control group with coronary artery stenosis ≥50% or ≥75% as the diagnosis criteria. The differences of quantitative and semi-quantitative parameters between the two groups were compared, and the diagnostic efficacy was compared by receiver operating characteristic(ROC) curve. Results: A total of 98 patients with a mean age of (62.1±8.7) years were included in the study, including 66 males (67%). At the patient level, with the positive standard of coronary artery stenosis≥50%, the left ventricle (LV) stress MBF (LV-sMBF) ((1.36±0.45) ml·min^-1·g^-1) and LV-MFR (1.45±0.43) of the stenosis group were lower than the LV-sMBF ((2.09±0.64) ml·min^-1·g^-1) and LV-MFR (2.17±0.54) of control group; summed SS and summed DS were higher than control group (all P<0.05). With the positive standard of coronary artery stenosis ≥75%, the LV-sMBF ((1.19±0.34) ml·min^-1·g^-1) and LV-MFR (1.34±0.35) of stenosis group were lower than the LV-sMBF ((1.94±0.63) ml·min^-1·g^-1) and MFR (2.00±0.58) of control group; all semi-quantitative parameters were higher than control group (all P<0.05). At the vascular level, with coronary artery stenosis ≥50% as the diagnosis criteria, the sMBF ((1.26±0.49) ml·min^-1·g^-1) and MFR (1.35±0.46) of stenosis group were lower than the sMBF ((1.95±0.70) ml·min^-1·g^-1) and MFR (2.05±0.65) of control group; SS and DS were higher than control group (all P<0.05). With coronary artery stenosis≥75% as the diagnosis criteria, the sMBF ((1.12±0.41) ml·min^-1·g^-1) and MFR (1.25±0.38) of stenosis group were lower than the sMBF ((1.84±0.70) ml·min^-1·g^-1) and MFR (1.93±0.66) of control group; all semi-quantitative parameters were higher than control group (all P<0.05). With coronary artery stenosis≥50% as the diagnosis criteria and CAG as the reference standard, the AUC and 95%CI of myocardial quantitative blood flow parameters indicated by ROC curve for diagnosis of CAD were 0.830 (0.783-0.877). The sensitivity (86.1% vs. 61.5%), specificity (82.6% vs. 73.8%), positive predictive value (77.8% vs. 62.5%), negative predictive value (89.3% vs. 73.0%) and accuracy (84.0% vs. 68.7%) were all higher than the semi-quantitative parameters (all P<0.05). With coronary artery stenosis≥75% as the diagnosis criteria, the AUC and 95%CI of myocardial quantitative blood flow parameters indicated by ROC curve for diagnosis of CAD were 0.832(0.785-0.879). The sensitivity (89.2% vs. 67.6%), negative predictive value (95.5% vs. 86.2%) and accuracy (80.6% vs. 68.0%) were all higher than semi-quantitative parameters (all P<0.05). Conclusion: Compared with traditional SPECT MPI derived semi-quantitative parameters, diagnostic efficacy for CAD is higher using CZT SPECT quantitative myocardial blood flow parameters, this strategy thus has additional diagnostic benefits and incremental value on the diagnosis of CAD.
Aged ; Constriction, Pathologic ; Coronary Angiography ; Coronary Artery Disease/diagnostic imaging* ; Coronary Stenosis/diagnostic imaging* ; Cross-Sectional Studies ; Humans ; Male ; Middle Aged ; Myocardial Perfusion Imaging/methods* ; Retrospective Studies ; Tomography, Emission-Computed, Single-Photon/methods*

To compare diagnostic value of 4 kinds of target-to-nontarget ratio (T/NT), and to choose a better one to assess thyroid associated ophthalmopathy (TAO) activity.
 Methods: The clinical data were collected for 29 newly-diagnosed patients (58 eyes) with TAO who underwent orbital 99mTc-DTPA single photon emission computed tomography/computed tomography (SPECT/CT) fusion images according to the clinical activity score (CAS). They were divided into an active group (18 cases, 36 eyes), an inactive group (11 cases, 22 eyes), and a control group (9 cases, 18 eyes). Diagnostic value of orbital/occipital lobe radioactive uptake count ratio (T/NT1), orbital/occipital radioactive uptake count ratio (T/NT2), orbital/thalamus radioactive uptake count ratio (T/NT3), and orbital/cerebellar radioactivity uptake count ratio (T/NT4) were calculated, and the CAS of Spearman rank correlation and receiver operating characteristic (ROC) curve were analyzed.
 Results: T/NT1, T/NT2 and CAS were correlated (r1=0.873, r2=0.527; P<0.001), with the better correlation between T/NT1 and CAS and there was no correlation between T/NT3, T/NT4 and CAS (r3=0.039, r4=0.090; P>0.05). Area under the ROC curve of T/NT1 was 0.860, area under the ROC curve of T/NT2 was 0.581, and the accuracy for T/NT1 on TAO activity was good. T/NT1=9.74 could be used as active threshold for judge of TAO in patients.
 Conclusion: There is a good correlation between T/NT1 and CAS. TAO activity assessment possesses high diagnostic value, and SPECT/CT together with imaging anatomical location is more accurate.
Case-Control Studies ; Graves Ophthalmopathy ; diagnostic imaging ; Humans ; Orbit ; diagnostic imaging ; ROC Curve ; Radiopharmaceuticals ; Statistics, Nonparametric ; Technetium Tc 99m Pentetate ; Tomography, Emission-Computed, Single-Photon ; methods

PURPOSE: Until now, there was no single standardized regional segmentation method of planar lung perfusion scan.We compared planar scan based two segmentation methods, which are frequently used in the Society of Nuclear Medicine, with reference to the lung perfusion single photon emission computed tomography (SPECT)/computed tomography (CT) derived values in lung cancer patients.METHODS: Fifty-five lung cancer patients (male:female, 37:18; age, 67.8 ± 10.7 years) were evaluated. The patients underwent planar scan and SPECT/CT after injection of technetium-99 m macroaggregated albumin (Tc-99 m-MAA). The % uptake and predicted postoperative percentage forced expiratory volume in 1 s (ppoFEV1%) derived from both posterior oblique (PO) and anterior posterior (AP) methods were compared with SPECT/CT derived parameters. Concordance analysis, paired comparison, reproducibility analysis and spearman correlation analysis were conducted.RESULTS: The % uptake derived from PO method showed higher concordance with SPECT/CT derived % uptake in every lobe compared to AP method. Both methods showed significantly different lobar distribution of%uptake compared to SPECT/CT. For the target region, ppoFEV1% measured from PO method showed higher concordance with SPECT/CT, but lower reproducibility compared to AP method. Preliminary data revealed that every method significantly correlated with actual postoperative FEV1%, with SPECT/CT showing the best correlation.CONCLUSIONS: The PO method derived values showed better concordance with SPECT/CT compared to the AP method. Both PO and AP methods showed significantly different lobar distribution compared to SPECT/CT. In clinical practice such difference according to different methods and lobes should be considered for more accurate postoperative lung function prediction.
Forced Expiratory Volume ; Humans ; Lung Neoplasms ; Lung ; Matched-Pair Analysis ; Methods ; Nuclear Medicine ; Perfusion Imaging ; Perfusion ; Tomography, Emission-Computed, Single-Photon

Aged ; Aged, 80 and over ; Carotid Artery Diseases ; physiopathology ; surgery ; Cerebrovascular Circulation ; physiology ; Female ; Humans ; Iofetamine ; Male ; Perioperative Period ; Radiopharmaceuticals ; Stents ; Tomography, Emission-Computed, Single-Photon ; methods

BACKGROUNDMyocardial perfusion grade (MPG) is an accepted method of evaluating myocardial perfusion. However, it does not take into the account, the extent of the perfusion. We hypothesized that myocardial blush area times MPG (total blush) would be more accurate than simple MPG, and yield better prognostic information.

METHODSAbout 34 patients were recruited after they had consented to both coronary angiography (CAG) and single photon emission computed tomography (SPECT), and divided into two groups. A special dedicated computer was employed to calculate the total blush. The CAG was performed as a conventional way. Scintigraphic technetium 99m methoxyisobutyl-isonitrile rest and stress images were evaluated quantitatively. The comparison was made between stenosis versus chronic total occlusion (CTO), MPG 1, 2 versus MPG 3, percutaneous intervention (PCI) successful versus failure. A correlation was made between ejection fraction (EF) and myocardial perfusion by MPG, total blush, SPECT, and syntax score.

RESULTSThe perfusion indices of total blush, summed difference score (SDS) and syntax score were insignificant between the two groups (P > 0.05). However, the left ventricular end diastolic volume was significantly larger in CTO (P < 0.05). The patients with stenosis had better MPG than with CTO (P < 0.05). The increased MPG was associated with increased total blush, higher syntax score, and EF (P < 0.05). Successful PCI resulted in better perfusion indicated by increased total blush, and MPG (P < 0.05) but successful PCI did not change syntax score, EF and SDS significantly. Multivariate linear analysis with EF as the dependent factor and syntax score, SDS, total blush, blush area, and MPG as the independent factors showed a significantly higher degree of correlation (R = 0.87, P < 0.05).

CONCLUSIONAfter PCI the total blush and EF improved significantly indicating its potential application in the future.

Aged ; Coronary Angiography ; methods ; Coronary Artery Disease ; diagnosis ; diagnostic imaging ; Female ; Humans ; Male ; Middle Aged ; Tomography, Emission-Computed, Single-Photon

PURPOSE: Adipose-derived stem cells (ADSCs) are known to be potentially effective in regeneration of damaged tissue. We aimed to assess the effectiveness of intracoronary administration of ADSCs in reducing the infarction area and improving function after acute transmural myocardial infarction (MI) in a porcine model. MATERIALS AND METHODS: ADSCs were obtained from each pig's abdominal subcutaneous fat tissue by simple liposuction. After 3 passages of 14-days culture, 2 million ADSCs were injected into the coronary artery 30 min after acute transmural MI. At baseline and 4 weeks after the ADSC injection, 99mTc methoxyisobutylisonitrile-single photon emission computed tomography (MIBISPECT) was performed to evaluate the left ventricular volume, left ventricular ejection fraction (LVEF; %), and perfusion defects as well as the myocardial salvage (%) and salvage index. At 4 weeks, each pig was sacrificed, and the heart was extracted and dissected. Gross and microscopic analyses with specific immunohistochemistry staining were then performed. RESULTS: Analysis showed improvement in the perfusion defect, but not in the LVEF in the ADSC group (n=14), compared with the control group (n=14) (perfusion defect, -13.0+/-10.0 vs. -2.6+/-12.0, p=0.019; LVEF, -8.0+/-15.4 vs. -15.9+/-14.8, p=0.181). There was a tendency of reducing left ventricular volume in ADSC group. The ADSCs identified by stromal cell-derived factor-1 (SDF-1) staining were well co-localized by von Willebrand factor and Troponin T staining. CONCLUSION: Intracoronary injection of cultured ADSCs improved myocardial perfusion in this porcine acute transmural MI model.
Adipose Tissue/cytology ; Animals ; Bone Marrow Cells/cytology/*metabolism ; Chemokine CXCL12 ; Coronary Vessels ; Female ; Heart/physiopathology ; Heart Ventricles ; *Mesenchymal Stromal Cells ; Myocardial Infarction/physiopathology/radionuclide imaging/*therapy ; *Stem Cell Transplantation ; Swine ; Technetium Tc 99m Sestamibi/*pharmacology ; Tomography, Emission-Computed, Single-Photon/*methods ; Troponin T ; *Ventricular Function, Left

PURPOSE: We evaluated hemodynamic significance of stenosis on magnetic resonance angiography (MRA) using acetazolamide perfusion single photon emission computed tomography (SPECT). MATERIALS AND METHODS: Of 171 patients, stenosis in internal carotid artery (ICA) and middle cerebral artery (MCA) (ICA-MCA) on MRA and cerebrovascular reserve (CVR) of MCA territory on SPECT was measured using quantification and a 3-grade system. Stenosis and CVR grades were compared with each other, and their prognostic value for subsequent stroke was evaluated. RESULTS: Of 342 ICA-MCA, 151 (44%) presented stenosis on MRA; grade 1 in 69 (20%) and grade 2 in 82 (24%) cases. Decreased CVR was observed in 9% of grade 0 stenosis, 25% of grade 1, and 35% of grade 2. The average CVR of grade 0 was significantly different from grade 1 (p<0.001) and grade 2 stenosis (p=0.007). In quantitative analysis, average CVR index was -0.56+/-7.91 in grade 0, -1.81+/-6.66 in grade 1 and -1.18+/-5.88 in grade 2 stenosis. Agreement between stenosis and CVR grades was fair in patients with lateralizing and non-lateralizing symptoms (kappa=0.230 and 0.346). Of the factors tested, both MRA and CVR were not significant prognostic factors (p=0.104 and 0.988, respectively), whereas hypertension and renal disease were significant factors (p<0.05, respectively). CONCLUSION: A considerable proportion of ICA-MCA stenosis detected on MRA does not cause CVR impairment despite a fair correlation between them. Thus, hemodynamic state needs to be assessed for evaluating significance of stenosis, particularly in asymptomatic patients.
*Acetazolamide ; Adult ; Aged ; Aged, 80 and over ; Brain/blood supply/radionuclide imaging ; Carotid Artery, Internal/physiopathology/radionuclide imaging ; Carotid Stenosis/physiopathology/*radionuclide imaging ; *Cerebrovascular Circulation ; Constriction, Pathologic ; Diuretics ; Female ; *Hemodynamics ; Humans ; Hypertension/physiopathology ; Iodine Radioisotopes ; *Magnetic Resonance Angiography ; Male ; Middle Aged ; *Radiopharmaceuticals ; Tomography, Emission-Computed, Single-Photon/*methods

OBJECTIVETo investigate the value of (99)Tc(m)N-NOET dual-phase SPECT in differential diagnosis of benign and malignant lung tumors.

METHODSCT scan, early (20 to 30 min) and delayed (2 h) imaging of NOET SPECT were performed on 61 patients suspected of lung lesions before operation. The results were compared with the pathological findings. All cases were not treated with radiotherapy, chemotherapy or surgery before checks. Moreover, all patients had pathological diagnosis. To determine the value in differential diagnosis of tumors by analyzing the tumor uptake and excretion of (99)Tc(m)N-NOET, and the results were compared with that of CT.

RESULTSThe value of early T/N ratio (ER) in the malignant (G1) and benign (G2) groups was 1.25 ± 0.15 and 1.09 ± 0.11 (P < 0.001), respectively, and delayed T/N ratio (DR) was 1.40 ± 0.17 and 1.18 ± 0.21 (P < 0.001). The retention index (RI) of groups G1 was (12.22 ± 6.38)% and group G2 was (8.3 ± 10.91)%, with a non-significant difference between them (P > 0.05). The ER, DR and RI of NOET SPECT in the malignant patients were not significantly correlated with TNM staging, pathological types, tumor diameter, cavity in the lung tumor mass, history of smoking, tumor size and patient gender (P > 0.05). The sensitivity of NOET dual-phase SPECT and CT in the differential diagnosis of benign and malignant lung tumors was 94.1% vs. 90.2%, specificity was 70.0% vs. 80.0% , positive predictive value (PPV) was 94.1% vs. 95.8%, negative predictive value (NPV) was 70.0% vs. 61.5 %, and accuracy was 90.2%. vs. 88.5% (P > 0.05 for all).

CONCLUSIONS(99)Tc(m)N- NOET dual-phase SPECT could be used in differential diagnosis of benign and malignant lung tumors, with no significant differences compared with the efficacy of CT imaging. The semiquantitative indexes (ER, DR and RI) of NOET SPECT can also be used in differential diagnosis of benign and malignant lung tumors, and are not significantly correlated with TNM staging, pathological types, tumor diameter, cavity of the lung tumor mass, history of smoking, tumor size and patient gender.

Diagnosis, Differential ; Humans ; Lung Neoplasms ; diagnostic imaging ; Neoplasm Staging ; Tomography, Emission-Computed, Single-Photon ; methods

Extramedullary pulmonary hematopoiesis is a rare entity with a limited number of case reports in the available literature only. We report the case of a 66-year-old man with known primary myelofibrosis, in whom a Technetium-99m sulfur colloid bone marrow scan with single-photon emission computed tomography (SPECT)/CT revealed a pulmonary hematopoiesis as the cause of pulmonary hypertension and severe tricuspid regurgitation. To the best of our knowledge, this is the first description of Technetium-99m sulfur colloid SPECT/CT imaging in this rare condition.
Aged ; Bone Marrow/*radionuclide imaging ; *Hematopoiesis, Extramedullary ; Humans ; Hypertension, Pulmonary/*etiology/radionuclide imaging ; Lung/*radionuclide imaging ; Male ; Primary Myelofibrosis/complications ; Technetium Tc 99m Sulfur Colloid/diagnostic use ; Tomography, Emission-Computed, Single-Photon/methods ; Tomography, X-Ray Computed ; Tricuspid Valve Insufficiency/*etiology/radionuclide imaging