Ultrasound Muscle Thickness Evaluation
Ultrasound imaging was performed by using a high resolution ACUSON S 2000 ultrasound machine (Siemens, Munich, Germany) with a 9L4 Linear Transducer. Measurements and analyses were performed by a single radiologist with eight years of experience. Bilateral masseter muscles were assessed in the resting position. During the USG procedure, the head of the patients was adjusted according to the measured side. While imaging, the probe was held perpendicular to the muscle mass and the anterior-posterior direction thickness and muscle volume were measured in transverse sections. Muscle thickness was measured from three different points of the masseter muscle and the average of the three measurements was taken and stored in USG machine pacs system for further analysis.