Application of Region of Interest Definition to Quadtree-Based Compression of CT Images

Application of Region of Interest Definition to Quadtree-Based Compression of CT Images

A quadtree-based data compression algorithm can provide different levels of compression within and outside of regions of interest (ROIs). The current study shows whether ROI compression can provide greater compression or diagnostic accuracy than uniform quadtree compression. In 75 single CT images f...

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Veröffentlicht in:Investigative radiology 1990-06, Vol.25 (6), p.703-707
Hauptverfasser: HALPERN, ETHAN J, PREMKUMAR, AHALYA, MULLEN, DAVID J, NG, CHRIS C, LEVY, HOWARD M, NEWHOUSE, JEFFREY H, AMIS, E STEPHEN, SANDERS, LINDA M, MUN, IN K
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Algorithms
Humans
Image Processing, Computer-Assisted
Radiology Information Systems
Tomography, X-Ray Computed
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container_end_page 707
container_issue 6
container_start_page 703
container_title Investigative radiology
container_volume 25
creator HALPERN, ETHAN J
PREMKUMAR, AHALYA
MULLEN, DAVID J
NG, CHRIS C
LEVY, HOWARD M
NEWHOUSE, JEFFREY H
AMIS, E STEPHEN
SANDERS, LINDA M
MUN, IN K
description A quadtree-based data compression algorithm can provide different levels of compression within and outside of regions of interest (ROIs). The current study shows whether ROI compression can provide greater compression or diagnostic accuracy than uniform quadtree compression. In 75 single CT images from 75 consecutive abdominal examinations, 43 abnormalities were identified and surrounded by ROIs. Three radiologists interpreted the images following (I) 50:1 compression of the entire image; (2) ROI compression at five decreasing compression ratios (with 50:1 compression outside the ROI); and (3) reversible (lossless) compression ratio 3:1) yielded a sensitivity of 96%. ROI compression of 15:1 was achieved with no loss of sensitivity; ROI compression of 28:1 yielded a sensitivity of 91% (not significantly different). At any given compression ratio, diagnostic sensitivity was greater with ROI compression than with uniform quadtree compression. For purposes of image archiving, quadtree-based ROI compression is superior to uniform compression of CT images.
doi_str_mv 10.1097/00004424-199006000-00015
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subjects Algorithms
Humans
Image Processing, Computer-Assisted
Radiology Information Systems
Tomography, X-Ray Computed
title Application of Region of Interest Definition to Quadtree-Based Compression of CT Images
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