Bedside Ultrasound Measurement of Rectus Femoris: A Tutorial for the Nutrition Support Clinician

Table 1

Identification of structures.

Order	Structure	Description
1	Skin	Hyperechoic layer adjacent to the transducer [18].
2	Subcutaneous tissue (fat)	Hypoechoic layer of variable thickness with hyperechoic lines resembling a feather [18].
3	Muscular fascia	Hyperechoic layer corresponding to the first interface where the RF interposes.
4	Rectus femoris	Semicircle structure delimited by the muscular fascia and the second interface.
5	Second interface	Hyperechoic layer where the VI interposes.
6	Vastus intermedius	Rectangular structure delimited by the second interface and the bony surface.
7	Bony surface	Hypoechoic circular structure delimited (acoustic shadow) by a hyperechoic layer corresponding the femur cortical layer (sonic surface) [18].