» Articles » PMID: 29998146

Development of an I-metaiodobenzylguanidine Myocardial Three-Dimensional Quantification Method for the Diagnosis of Lewy Body Disease

Overview
Specialty Nuclear Medicine
Date 2018 Jul 13
PMID 29998146
Citations 1
Authors
Affiliations
Soon will be listed here.
Abstract

Objectives: We recently developed a new uptake index method for I-metaiodobenzylguanidine (I-MIBG) heart uptake measurements by using planar images (radioisotope angiography and planar image) for the diagnosis of Lewy body disease (LBD), including Parkinson's disease (PD) and dementia with Lewy bodies (DLB). However, the diagnostic accuracy of the uptake index was approximately equal to that of the heart-to-mediastinum ratio (H/M) for the discrimination of the LBD and non-LBD patients. A simple and pain-free uptake index method using I-MIBG SPECT images by modifying the uptake index method may show better diagnostic accuracy than the planar uptake index method. We hypothesized that the development of a new uptake index method for the determination of I-MIBG using single-photon emission computed tomography (SPECT) imaging would provide a reliable and reproducible diagnostic tool for clinical application. Regarding this, the purpose of this study was to develop a new uptake index method with a simple protocol to determine I-MIBG uptake on SPECT.

Methods: The I-MIBG input function was determined from the input counts of the pulmonary artery, assessed by analyzing the pulmonary artery time-activity curves. The I-MIBG output function was obtained from I-MIBG SPECT counts on the polar map. The uptake index was calculated through dividing the output function by the input function (SPECT uptake method). For the purpose of the study, 77 patients underwent I-MIBG SPECT, with an average of 31.5 min after clinical assessment and injection of the tracer. The H/M values, as well as planar and SPECT uptake indices were calculated, and then correlated with clinical features.

Results: According to the results, values obtained for LBD were significantly lower than those for non-LBD in all analyses (P<0.01). The overlap of the H/M values between the LBD and non-LBD cases ranged from 2.06 to 2.50. Furthermore, the overlap in uptake index values between LBD and non-LBD cases in planar image analysis was 1.05-1.29. The SPECT uptake index method showed the least overlap of 1.23-1.25, with the highest value for LBD patients clearly distinguished from the lowest value for the non-LBD patients.

Conclusion: The new I-MIBG SPECT quantification method, developed by the input counts of the pulmonary artery, clearly distinguished LBD from non-LBD. Therefore, this method may be appropriate for routine clinical study.

Citing Articles

The utility of heart-to-mediastinum ratio using a planar image created from IQ-SPECT with Iodine-123 meta-iodobenzylguanidine.

Shibutani T, Nakajima K, Yoneyama H, Konishi T, Okuda K, Onoguchi M J Nucl Cardiol. 2020; 28(6):2569-2577.

PMID: 32103408 DOI: 10.1007/s12350-020-02081-9.

References
1.
Patil H, Bateman T, McGhie A, Burgett E, Courter S, Case J . Diagnostic accuracy of high-resolution attenuation-corrected Anger-camera SPECT in the detection of coronary artery disease. J Nucl Cardiol. 2013; 21(1):127-34. DOI: 10.1007/s12350-013-9817-9. View

2.
van der Veen B, Al Younis I, de Roos A, Stokkel M . Assessment of global cardiac I-123 MIBG uptake and washout using volumetric quantification of SPECT acquisitions. J Nucl Cardiol. 2012; 19(4):752-62. PMC: 3395351. DOI: 10.1007/s12350-012-9539-4. View

3.
El Fakhri G, Buvat I, Benali H, Todd-Pokropek A, Di Paola R . Relative impact of scatter, collimator response, attenuation, and finite spatial resolution corrections in cardiac SPECT. J Nucl Med. 2000; 41(8):1400-8. View

4.
Nakajima K, Okuda K, Yoshimura M, Matsuo S, Wakabayashi H, Imanishi Y . Multicenter cross-calibration of I-123 metaiodobenzylguanidine heart-to-mediastinum ratios to overcome camera-collimator variations. J Nucl Cardiol. 2014; 21(5):970-8. PMC: 4167440. DOI: 10.1007/s12350-014-9916-2. View

5.
Ofuji A, Mimura H, Yamashita K, Takaki A, Sone T, Ito S . Development of a simple non-invasive microsphere quantification method for cerebral blood flow using I-123-IMP. Ann Nucl Med. 2016; 30(3):242-9. DOI: 10.1007/s12149-015-1053-8. View