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ID 30978
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Author
Matsushita, Toshi
Anami, Daigo
Arioka, Tadashi
Inoue, Seiji
Kariya, Yusuke
Fujimoto, Masako
Ida, Kentaro
Sasai, Nobuya
Kaji, Mitsumasa
Kanazawa, Susumu Kakenhi
Abstract

With the aim of sequence optimization in susceptibility-weighted imaging (SWI), 2 image acquisition parameters (slice thickness and matrix size) and 2 image processing conditions (number of slices per minimum intensity projection (MIP) and Sliding Window) were investigated using a 1.5-T magnetic resonance imaging (MRI) system. The subjects were 12 healthy volunteers and the target region for scanning was the whole brain. Informed consent was obtained from all subjects. First, susceptibility-weighted images were acquired with various slice thicknesses from 1mm to 5mm and various matrix sizes from 256x256 to 512x512, and the images were assessed in terms of the contrast-to-noise ratio (CNR) and were also visually evaluated by three radiologists. Then, the number of slices per MIP and the usefulness of the Sliding Window were investigated. In the study of the optimal slice thickness and matrix size, the results of visual evaluation suggested that a slice thickness of 3mm and a matrix size of 448x448 are optimal, while the results of evaluation based on CNR were not significant. As regards the image processing conditions, the results suggested that the number of slices per MIP should be set to a minimum value of 2 and that the use of Sliding Window is effective. The present study provides useful reference data for optimizing SWI sequences.

Keywords
susceptibility
phase
contrast-to-noise ratio
number of slices per MIP
Sliding Window
Amo Type
Original Article
Published Date
2008-06
Publication Title
Acta Medica Okayama
Volume
volume62
Issue
issue3
Publisher
Okayama University Medical School
Start Page
159
End Page
168
ISSN
0386-300X
NCID
AA00508441
Content Type
Journal Article
language
英語
File Version
publisher
Refereed
True
PubMed ID
Web of Sience KeyUT