Evaluation of a quadtree-based compression algorithm with digitized urograms

E. J. Halpern, J. H. Newhouse, E. S. Amis, H. M. Levy, H. W. Lubetsky

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The effect of a quadtree-based data-compression algorithm on the diagnostic yield in digitized radiographs was studied for 100 urograms. Each image was digitized and reviewed at nine decreasing compression ratios ranging from 90:1 to 4.2:1, followed by a review of the uncompressed digital images. Four radiologists independently reviewed the digitized images and the original radiographs and agreed on a reference standard of 201 findings. Sensitivity, measured by the number of findings noted on the compressed digital images, decreased with increasing compression ratios at and above the 11:1 level. No loss of sensitivity was noted with a compression ratio of 4.2:1. Sensitivity decreased more precipitously for calcifications than for soft-tissue masses. Only a minimal loss of sensitivity for bilateral renal function was noted, even with high compression ratios. False-positive rates were unaffected by compression. The authors conclude that quadtree compression ratios of 11:1 and higher may result in loss of sensitivity in clinically relevant findings.

Original languageEnglish (US)
Pages (from-to)259-263
Number of pages5
JournalRadiology
Volume171
Issue number1
StatePublished - 1989
Externally publishedYes

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Data Compression
Urography
Kidney
Radiologists

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology

Cite this

Halpern, E. J., Newhouse, J. H., Amis, E. S., Levy, H. M., & Lubetsky, H. W. (1989). Evaluation of a quadtree-based compression algorithm with digitized urograms. Radiology, 171(1), 259-263.

Evaluation of a quadtree-based compression algorithm with digitized urograms. / Halpern, E. J.; Newhouse, J. H.; Amis, E. S.; Levy, H. M.; Lubetsky, H. W.

In: Radiology, Vol. 171, No. 1, 1989, p. 259-263.

Research output: Contribution to journalArticle

Halpern, EJ, Newhouse, JH, Amis, ES, Levy, HM & Lubetsky, HW 1989, 'Evaluation of a quadtree-based compression algorithm with digitized urograms', Radiology, vol. 171, no. 1, pp. 259-263.
Halpern EJ, Newhouse JH, Amis ES, Levy HM, Lubetsky HW. Evaluation of a quadtree-based compression algorithm with digitized urograms. Radiology. 1989;171(1):259-263.
Halpern, E. J. ; Newhouse, J. H. ; Amis, E. S. ; Levy, H. M. ; Lubetsky, H. W. / Evaluation of a quadtree-based compression algorithm with digitized urograms. In: Radiology. 1989 ; Vol. 171, No. 1. pp. 259-263.
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