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Computed tomography and ultrasound imaging of frail and not-frail patients. (A) Cross-sections of psoas muscles on computed tomography of a patient who is frail. (B) Corresponding quadriceps depth on ultrasound of the same frail patient. (C) Cross-sections of psoas muscles on computed tomography of a patient who is not frail. (D) Corresponding quadriceps depth on ultrasound of the same not-frail patient.
