H
Hector Lopez
Researcher at Center for Devices and Radiological Health
Publications - 8
Citations - 1941
Hector Lopez is an academic researcher from Center for Devices and Radiological Health. The author has contributed to research in topics: Imaging phantom & Speckle pattern. The author has an hindex of 7, co-authored 8 publications receiving 1850 citations. Previous affiliations of Hector Lopez include Food and Drug Administration.
Papers
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Journal ArticleDOI
Statistics of Speckle in Ultrasound B-Scans
TL;DR: In this article, the authors derived autocorrelation functions and power spectra derived from B-scans of a scattering phantom containing many scatterers per resolution cell, leading naturally to the definition of the average speckle spot or cell sue, and this inturn is comparable to the resolution cell.
Journal ArticleDOI
Low Contrast Detectability and Contrast/Detail Analysis in Medical Ultrasound
TL;DR: It is found that the contrast/detail results for envelope detection in diagnostic ultrasound are almost identical with the results for square law detection with the latter serving as an upper limit for performance in lesion detection.
Journal ArticleDOI
A contrast‐detail analysis of diagnostic ultrasound imaging
TL;DR: A new tissue-stimulating phantom is described which has been used to measure the threshold detection of varying contrast, simulated lesions and the results indicate that detection of high contrast targets is limited by the imaging system's spatial resolution.
Journal ArticleDOI
Frequency independent ultrasound contrast-detail analysis.
TL;DR: An ultrasound contrast-detail phantom has been developed that includes eight conical targets whose B-mode images show disk lesions such that the object contrast of each lesion relative to background is independent of the imaging device or transducer frequency/spectrum.
Patent
Contrast resolution tissue equivalent ultrasound test object
Hector Lopez,Stephen W. Smith +1 more
TL;DR: A contrast resolution tissue-equivalent ultrasound test phantom comprises a block of material having ultrasonic propagation characteristics similar to that of human or animal tissue, each having a different reflectivity.