Ishida Hiroshi, Suehiro Tadanobu, Suzuki Keita, Yoneda Tsuyoshi, Watanabe Susumu
Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare: 288 Matsushima, Kurashiki, Okayama 701-0193, Japan.
J Phys Ther Sci. 2017 Dec;29(12):2190-2193. doi: 10.1589/jpts.29.190. Epub 2017 Dec 13.
[Purpose] This study aimed to assess the influence of ultrasound (US) transducer tilt on muscle thickness and echo intensity of the rectus femoris muscle (RF) in healthy subjects. [Subjects and Methods] Fourteen healthy male subjects (20.8 ± 0.8 years) participated in this study. Transducer tilt was measured during US, with a digital angle gauge. Muscle thickness and echo intensity were measured in 4 transducer tilt conditions: reference angle; +3°; +6°; and +9° cranial from the reference angle. [Results] All differences in transducer tilt relative to the reference condition were larger than the minimal detectable change (MDC) of the reference condition. All differences in muscle thickness relative to the reference condition were not larger than the MDC of the reference condition. All differences in the echo intensity relative to the reference condition, except between the reference and the +3° condition, were larger than the MDC of the reference condition. [Conclusion] Our results indicated that an examiner should maintain a precise transducer tilt during repeated US measurements to quantify the minimal change in the echo intensity of the RF.
[目的] 本研究旨在评估超声（US）换能器倾斜对健康受试者股直肌（RF）肌肉厚度和回声强度的影响。[对象与方法] 14名健康男性受试者（20.8±0.8岁）参与了本研究。在超声检查期间，使用数字角度仪测量换能器倾斜度。在4种换能器倾斜条件下测量肌肉厚度和回声强度：参考角度；相对于参考角度向上3°；向上6°；以及向上9°。[结果] 相对于参考条件，换能器倾斜的所有差异均大于参考条件的最小可检测变化（MDC）。相对于参考条件，肌肉厚度的所有差异均不大于参考条件的MDC。相对于参考条件，除参考条件与+3°条件之间外，回声强度的所有差异均大于参考条件的MDC。[结论] 我们的结果表明，检查者在重复超声测量期间应保持精确的换能器倾斜度，以量化股直肌回声强度的最小变化。
