THE EFFECT OF BODY WALL ON VIDEO SIGNAL ANALYSIS MEASUREMENTS

Rectangular body wall specimens were extracted from 16 juvenile swine and 9 adult beagle hounds after euthanasia. The body wall specimen included the epidermis to parietal membrane, with falciform fat removed. Ten images of a reference phantom with known attenuation and 10 additional images of the p...

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Bibliographic Details
Published in:Veterinary radiology & ultrasound 2003-03, Vol.44 (2), p.222-225
Main Authors: Waller III, Kenneth R., Knipp, Brian S., O'Brien, Robert T., Zagzebski, James A.
Format: Article
Language:English
Subjects:
Abdomen - diagnostic imaging
Animals
attenuation
body wall
dog
Dogs
echogenicity
nonlinear
Phantoms, Imaging - veterinary
Swine
Ultrasonography - instrumentation
Ultrasonography - methods
Ultrasonography - veterinary
ultrasound
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Summary:Rectangular body wall specimens were extracted from 16 juvenile swine and 9 adult beagle hounds after euthanasia. The body wall specimen included the epidermis to parietal membrane, with falciform fat removed. Ten images of a reference phantom with known attenuation and 10 additional images of the phantom with the specimen placed between the transducer and phantom surface were collected with a 5‐MHz ultrasound system and computer with frame grabber board. Mean pixel values were converted to relative echogenicities. Echogenicity versus depth yielded an estimate of attenuation. An unpaired t test was applied to compare reference attenuation values with and without body wall, and a Pearson correlation was applied to body Wall parameters versus measured attenuation through body wall. Measured attenuation through body wall increased significantly in dogs (P= 0.0016) and swine (P < 0.0001) when compared with phantom material alone. Increased attenuation positively correlated to body wall thickness (r= 0.6442) and mean gray level within body wall (r= 0.5069) for swine but not in canine. The presence of body wall in images used for video signal analysis significantly increases the measured attenuation in a phantom. This increase does not correlate with a measurable body wall parameter in dogs.
ISSN:1058-8183
1740-8261
DOI:10.1111/j.1740-8261.2003.tb01275.x