We compared the image quality of a pocket-sized ultrasound machine with a linear array probe(PUM)with that of the laptop type ultrasound machine(LUM)for normal subcutaneous tissue.
Six healthy adults volunteered to undergo ultrasound examination of their skin at sites where pressure ulcers frequently occur(i.e., sacrum, greater trochanter, heels)using two ultrasound systems. Examinations included transverse and longitudinal scans in three positions by each ultrasound system. Sacrum and right greater trochanter were assessed visually for the degree of clarity of the bone boundary, deep fascia, and superficial fascia. The right heel was assessed only for the degree of clarity of the bone boundary. Ultrasound images were visually classified as poor, fair, or good.
Overall, PUM in 30 images of 84 pairs which compared the images of the 3 positions with two ultrasound systems achieved clarity equivalent to or greater than that of LUM images. PUM showed lower image quality than LUM in 18 images of 24 pairs which compared the images of the bone boundary in the sacrum and right greater trochanter. In contrast, there was fair agreement between PUM and LUM regarding the bone boundary of the right heel.
Our results showed that PUM readings are in fair agreement with those obtained using LUM. PUM allows quick, though limited, performance. PUM, however, may be the only equipment available for an initial ultrasound assessment.
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