Measuring and testing – Vibration – By mechanical waves
Patent
1996-08-13
1997-09-23
Chilcot, Richard
Measuring and testing
Vibration
By mechanical waves
73 1DV, G01N 2900
Patent
active
056707193
ABSTRACT:
In accordance with the present invention there is presented an automated system for testing the ability of clinical ultrasound scanners to detect focal lesions in human tissue. An ultrasound scanner phantom containing background material mimicking the ultrasonic characteristics of human tissue and coplanar spherical target lesions ultrasonically contrasting with the background material is scanned using the ultrasound scanner to be tested. Digitized images are made of the ultrasound scan of slices in the ultrasound phantom containing background material only and of slices on which the focal lesions are centered. A lesion signal to noise ratio (SNR).sub.L is then calculated at each defined pixel coordinate in the target lesion slice. This calculation employs (1) a pixel value average calculated over a sample area of the target image slice centered at a pixel location and which is of a size approximately that of the cross-sectional area of the target lesions, (2) an average pixel value calculated over an averaging area centered at the same pixel coordinate but containing mostly background image data, and (3) a standard deviation of averaged pixel values calculated in the background material image plane. The proximal and distal depth range limits of detectability of an ultrasound scanner, for a given lesion diameter and contrast, may then be determined based on the number of pixel locations in a depth range of the scanned plane having an absolute value SNR greater than a threshold value.
REFERENCES:
patent: 4277367 (1981-07-01), Madsen et al.
patent: 4286455 (1981-09-01), Ophir et al.
patent: 4331021 (1982-05-01), Lopez et al.
patent: 4406153 (1983-09-01), Ophir et al.
patent: 4417582 (1983-11-01), Trimmer et al.
patent: 4453408 (1984-06-01), Clayman
patent: 4463592 (1984-08-01), Flax et al.
patent: 4476549 (1984-10-01), Dragonette et al.
patent: 4843866 (1989-07-01), Madsen et al.
patent: 5054310 (1991-10-01), Flynn
patent: 5276726 (1994-01-01), Galkin
patent: 5312755 (1994-05-01), Madsen et al.
New Product Announcement, V Wisconsin Spherical Void Phantom, Oct., 1988.
Smith, et al., "A contrast-detail analysis of diagnostic ultrasound imaging", Med. Phys., vol. 9, No. 1, pp. 4-12, Jan./Feb. 1982.
Madsen, et al., "An Anthropomorphic Ultrasound Breast Phantom Containing Intermediate-Sized Scatterers", Ultrasound in Med. & Biol., vol. 8, No. 4, pp. 381-392, 1982.
Madsen, et al., "Anthropomorphic Breast Phantoms for Assessing Ultrasonic Imaging System Performance and for Training Ultrasonographers: Part I", J. Clin. Ultrasound, vol. 10, pp. 67-75, Feb. 1982.
Madsen, et al., "Anthropomorphic Breast Phantoms for Assessing Ultrasonic Imaging System Performance and for Training Ultrasonographers: Part II", J. Clin. Ultrasound, vol. 10, pp. 91-100, Mar. 1982.
Goldstein, et al., "Particle Image-resolution Test Object", J. Ultrasound Med., vol. 2, pp. 195-209, May 1983.
Wagner, et al., "Statistics of Speckle in Ultrasound B-Scans", IEEE Trans. on Sonics and Ultrasonics, vol. 30, No. 3, pp. 156-163, May 1983.
Smith, et al., "Low Contrast Detectability and Contrast/Detail Analysis in Medical Ultrasound", IEEE Trans. on Sonics and Ultrasonics, vol. 30, No. 3, pp. 164-173, May 1983.
Goodsitt, et al., "A Three Dimensional Model for Generating the Texture in B-Scan Ultrasound Images", Ultrasonic Imaging, vol. 5, pp. 253-279, 1983.
Madsen, et al., "Method of data reduction for accurate determination of acoustic backscatter coefficients", J. Acoust. Soc. Am., vol. 76, No. 3, pp. 913-923, Sep. 1984.
Smith, et al., "Frequency Independent Ultrasound Contrast-Detail Analysis", Ultrasound in Med. & Biol., vol. 11, No. 3, pp. 467-477, May/Jun. 1985.
Wagner, et al., "Unified SNR analysis of medical imaging systems", Phys. Med. Biol., vol. 30, No. 6, pp. 489-518, 1985.
Thijssen, et al., "Gray Level Transforms and Lesion Detectability in Echographic Images", Ultrasonic Imaging, vol. 10, pp. 171-195, 1988.
Thijssen, et al., "Texture in Tissue Echograms", J. Ultrasound Med. vol. 9, pp. 215-229, 1990.
Lopez, et al., "Objective Analysis of Ultrasound Images by Use of a Computational Observer", IEEE Trans. on Med. Imaging, vol. 11, No. 4, pp. 496-506, Dec. 1992.
Insana, et al., "Visual detection efficiency in ultrasonic imaging: A framework for objective assessment of image quality, " J. Acoustic Soc. Am., vol. 95, No. 4, Apr. 1994.
Carson, "What a Hospital Physicist Needs in a Transducer Characterization Standard: Are Tissue Equivalent Test Objects Necessary?," IEEE Trans. on Sonics and Ultrasonics, vol. SU-26, No. 1, Jan. 1979, pp. 1-6.
Frank Gary R.
Madsen Ernest L.
Rownd Jason J.
Zagzebski James A.
Chilcot Richard
Noori Max H.
Wisconsin Alumni Research Foundation
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