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Title :適応型部分移動平均フィルタによる頭部単純CT画像における急性期脳梗塞の抽出能の改善
Title alternative :Improvement in Visibility and Detectability of Early Sign of Acute Stroke in Nonenhanced CT Images by Using and Adaptive Partial Smoothing Filter
Authors :高橋, 規之
李, 鎔範
蔡, 篤儀
石井, 清
神尾, 總一郎
Publisher :日本放射線技術学会
Issue Date :Nov-2005
Journal Title :日本放射線技術学会雑誌
Volume :61
Issue :11
Start Page :1531
End Page :1541
ISSN :0369-4305
Description :Detection of early infarct signs on nonenhanced CT is mandatory in patients with acute ischemic stroke. Loss of the gray-white matter interface at the lentiform nucleus or the insular ribbon has been an important early infact sign, which affects decisions on thrombolytic therapy. However, its detection is difficult, since early infarct sign is of subtle hypoattenuation. To improve the detectability of early infarct sign, image processing that could reduce local noise while preserving edges is desirable. To examine this issue, we devised an adaptive partial smoothing filter(APSF). Since the APSF markedly improves visibility of the normal gray-white matter interface, loss of the gray-white matter interface due to hypoattenuation could be more easily detected. The APSF was applied to clinical CT images in hyperacute stroke patients. Our preliminary results showed that the visibility and detectability of early infarct signs was much improved. To validate the usefulness of the proposed method, two commonly used smoothing filters were also employed for comparison. The results demonstrated the superiority of the APSF. Our proposed APSF can improve the visibility of the gray-white matter interface, thereby enhancing the detectability of early infarct signs.
Keywords :Computed tomography
Image processing
Cerebral infarction
Early CT sign
Type Local :学術雑誌論文
Language :jpn
URI :http://hdl.handle.net/10191/4862
fullTextURL :http://dspace.lib.niigata-u.ac.jp/dspace/bitstream/10191/4862/1/jsrt_61_11_1531_1541_2005.pdf
Appears in Collections:10 査読済論文 = Postprint

Please use this identifier to cite or link to this item: http://hdl.handle.net/10191/4862