title: Countermeasures against physical motion in schoolchildren requiring no sedation during rest and stress myocardial perfusion imaging with technetium-99m-tetrofosmin.
abstract: For children, cardiac nuclear medicine imaging has not been widely used because of problems of physical motion, even in schoolchildren who require no sedation. In this study, rest-stress myocardial perfusion imaging (MPI) with technetium-99m-tetrofosmin (Tc-99m TF) was performed with the use of a Vac-Loc cushion, a patient immobilizer commonly used for radiotherapy, for immobilizing school-age patients. The immobilizer attenuated the gamma radiation by 6%. By visual assessment, physical motion-related artifacts were markedly improved in images acquired with the immobilizer, compared to those without. In the assessment of image reproducibility with the immobilizer, taking the reproducibility as 2.5Σ + 0.7σ, there were deviations of 4.45, 5.28, and 3.28 mm along the X-, Y-, and Z-axes, respectively, demonstrating a high reproducibility and a negligible rest-stress position error. It is suggested that for radiotherapy, the immobilizer could expand the versatility of MPI while allowing only minimal physical motion in children.
authors.affiliation: Department of Radiology, Otsu Red Cross Hospital, 1-35 Nagara, Otsu, Shiga, 520-8511, Japan. hmrky77@u01.gate01.com
authors.forename: Hajime
authors.initials: H
authors.lastname: Monzen
authors.forename: Yuko
authors.initials: Y
authors.lastname: Ban
authors.forename: Makoto
authors.initials: M
authors.lastname: Hirata
authors.forename: Akira
authors.initials: A
authors.lastname: Nakanishi
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Suzuki
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Inoue
authors.forename: Taku
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Makoto
authors.initials: M
authors.lastname: Ogasawara
authors.forename: Chika
authors.initials: C
authors.lastname: Tanaka
authors.forename: Toru
authors.initials: T
authors.lastname: Iwasa
authors.forename: Rumio
authors.initials: R
authors.lastname: Yuki
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D007103:Immobilization / Q000379:methods*; D008297:Male; D055414:Myocardial Perfusion Imaging / Q000379:methods*; D009943:Organophosphorus Compounds; D015609:Organotechnetium Compounds; D012146:Rest; D012574:Schools; D013312:Stress, Physiological
chemical_list: D009943:Organophosphorus Compounds; D015609:Organotechnetium Compounds; C078700:technetium tc-99m tetrofosmin