| Acute cerebral infarction: effect of JPEG compression on detection at CT. | |
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MedLine Citation:
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PMID: 12601191 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To evaluate the effect of Joint Photographic Experts Group (JPEG) compression ratios of 10:1 and 20:1 on detection of acute cerebral infarction at computed tomography (CT). MATERIALS AND METHODS: CT images obtained in 25 patients with acute cerebral infarction and 25 patients with no lesions were compressed by means of a JPEG algorithm at ratios of 10:1 and 20:1. Normal and abnormal sections (on original and compressed images) were reviewed by using a color soft-copy computed monochrome cathode ray tube monitor. Five observers rated the presence or absence of a lesion with a 50-point scale (0, definitely absent; 25, equivocal; and 50, definitely present). Diagnostic accuracy was evaluated with receiver operating characteristic (ROC) curve analysis. Significant difference was defined as a P value less than.05 for the area tested with a two-tailed paired Student t test. RESULTS: At ROC analysis, no statistically significant difference was detected for all cases considered together (Az [area under the ROC curve] = 0.887 +/- 0.038 [mean +/- SD] on noncompressed images, Az = 0.897 +/- 0.038 on 10:1 compressed images, and Az = 0.842 +/- 0.073 on 20:1 compressed images; P >.05). CONCLUSION: JPEG compression at ratios of 10:1 and 20:1 was tolerated in the detection of acute cerebral infarction at CT. |
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Authors:
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Yoshimitsu Ohgiya; Takehiko Gokan; Hiroshi Nobusawa; Masanori Hirose; Noritaka Seino; Hidefumi Fujisawa; Maiko Baba; Kyoko Nagai; Keisuke Tanno; Nobuyuki Takeyama; Hirotsugu Munechika |
Publication Detail:
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Type: Journal Article Date: 2003-02-19 |
Journal Detail:
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Title: Radiology Volume: 227 ISSN: 0033-8419 ISO Abbreviation: Radiology Publication Date: 2003 Apr |
Date Detail:
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Created Date: 2003-04-01 Completed Date: 2003-06-02 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0401260 Medline TA: Radiology Country: United States |
Other Details:
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Languages: eng Pagination: 124-7 Citation Subset: AIM; IM |
Affiliation:
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Department of Radiology, Showa University School of Medicine, Tokyo, Japan. yogiya@gd5.so-net.ne.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acute Disease Adult Aged Aged, 80 and over Cerebral Infarction / radiography* Female Humans Image Processing, Computer-Assisted* Male Middle Aged Tomography, X-Ray Computed* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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