Establishment of attenuation correction method using myocardial gated X-ray/CT imaging in integrated SPECT/CT system

2016 Fiscal Year Final Research Report

• Project/Area Number: 26460725
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Medical Physics and Radiological Technology
• Research Institution: Kanazawa University
• Principal Investigator: ONOGUCHI Masahisa 金沢大学, 保健学系, 教授 (30283120)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 心筋動態ファントム / 心電図同期SPECT / SPECT/CT装置 / 減弱補正 / 心機能 / 心筋血流 / 心電図同期CT撮影法 / 被ばく線量

Outline of Final Research Achievements

The conventional dynamic cardiac phantom used in the field of nuclear medicine has a structure for which the size of the external side of the heartis fixed and only the inner side moves anteroposterior. Therefore, its usefulness in technical evaluation is limited. Hence, we developed a new dynamic cardiac phantom in which the outer and inner membranes freely move. Using a SPECT/CT system, we performed validation by filling the myocardial layer of the dynamic cardiac phantom with solution and the ventricle part with contrast medium. We evaluated myocardial wall motions of 3 segments (basal, mid, and apical) by setting the stroke ratios at 20:20 (ventricle-to-myocardial layer ratio). The myocardial wall motions at the stroke ratio of 20:20 were 7.50 ± 0.44, 11.15 ± 0.56, and 9.90 ± 0.24 mm in the basal, mid, and apical segments, respectively. These results suggest that the use of this phantom can realize technical evaluation that presumes various clinical conditions.

Free Research Field

心臓核医学