Nichols Kremer, Wright Lonnie B, Spencer Trey, Culp William C
College of Medicine, University of Arkansas for Medical Sciences, 4301 West Markham Street, Little Rock, AR 72205, USA.
J Vasc Interv Radiol. 2003 Dec;14(12):1553-7. doi: 10.1097/01.rvi.0000099527.29957.a6.
To objectively compare the echogenicity of several types of needles at clinically important angles of insonation.
Four commercial needles (Echotip, Mini-Stick, Echo-Coat, Surflo) and a prototype dimpled needle were tested in a liver phantom at angles of insonation ranging from 90 degrees to 15 degrees. Photodensity measurement determined echogenicity levels in arbitrary echogenicity units (EU).
At 90 degrees angles of insonation all needles were easily seen (60-76 EU) and echogenic levels were similar (P =.264). All values decreased with angulation. From the 35 degrees to 15 degrees angles, the prototype and Echotip needles were superior (P <.05). At 15 degrees the values were 43 EU for the prototype needle, 40 EU for the Echotip needle, 9.0 EU for the Echo-Coat needle, and 5.0 EU for the Surflo needle.
With angulation, all needles drop in echogenicity, with prototype dimpled and Echotip best maintaining visibility at clinically important angles.
在临床上重要的超声探测角度下，客观比较几种类型针的回声性。
在肝脏仿体中对四种商用针（回声针、迷你针、回声涂层针、舒尔孚针）和一种原型凹坑针进行测试，超声探测角度范围为90度至15度。通过光密度测量以任意回声性单位（EU）确定回声性水平。
在90度超声探测角度下，所有针都易于观察到（60 - 76 EU），且回声水平相似（P = 0.264）。所有值随角度变化而降低。从35度到15度角度，原型针和回声针表现更优（P < 0.05）。在15度时，原型针的值为43 EU，回声针为40 EU，回声涂层针为9.0 EU，舒尔孚针为5.0 EU。
随着角度变化，所有针的回声性都会下降，原型凹坑针和回声针在临床上重要的角度下能最好地保持可见性。
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