Fig. 1

Measurement of the SWE value of rectus femoris and patellar tendon between healthy controls and COPD patients. (A) Conventional two-dimensional ultrasound image of the quadriceps femoris. (B) Measurement of the SWE value of rectus femoris in healthy controls. (C) Measurement of the SWE value of rectus femoris in COPD patients. (D) Conventional two-dimensional ultrasound image of patellar tendon. (E) Measurement of the SWE value of patellar tendon in healthy controls. (F) Measurement of the SWE value of patellar tendon in COPD patients.