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Proceedings Paper

Programmable ultrasound scan conversion on a media-processor-based system
Author(s): Siddhartha Sikdar; Ravi Managuli; Tsuyoshi Mitake; Tetsuya Hayashi; Yongmin Kim
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Paper Abstract

Scan conversion is an important ultrasonic processing stage that maps the acquired polar coordinate data to Cartesian coordinates for display. This requires computationally expensive square root and arctangent calculations for geometric transformation. Previously, we developed an algorithm for implementing scan conversion for gray-scale images using pre-computed lookup tables. In a clinical setting, however, interactive changes of scan conversion parameters, e.g., zoom and sector angle, require these table to be recomputed often. In this paper, we describe a fast lookup table generation algorithm and its implementation on Hitachi/Equator's MAP-CA mediaprocessor architecture. In addition, we have extended the gray-scale scan conversion algorithm for color images, which requires interpolation between angular data. For a 600x420 output image, gray- scale scan conversion takes 12 ms while color scan conversion takes 20.3 ms on a 300 MHz MAP-CA. Interactive parameter changes take 102.5 ms for table regeneration. We believe that this high performance is an important step towards making software-based ultrasound programmable systems using mediaprocessors a reality. Such a system would provide more flexibility and improved cost/performance in the future than the existing hardwired solutions.

Paper Details

Date Published: 28 May 2001
PDF: 13 pages
Proc. SPIE 4319, Medical Imaging 2001: Visualization, Display, and Image-Guided Procedures, (28 May 2001); doi: 10.1117/12.428117
Show Author Affiliations
Siddhartha Sikdar, Univ. of Washington (United States)
Ravi Managuli, Univ. of Washington (United States)
Tsuyoshi Mitake, Hitachi Medical Corp. (Japan)
Tetsuya Hayashi, Hitachi Medical Corp. (Japan)
Yongmin Kim, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 4319:
Medical Imaging 2001: Visualization, Display, and Image-Guided Procedures
Seong Ki Mun, Editor(s)

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