Logiq e9 us system

A senior interventional radiologist with 13 years of experience in RFA (>1,000 cases of RFA, >200 cases of imaging fusion) and a junior interventional radiologist, who was less experienced, with 3 years of experience in RFA (>50 cases of RFA, >30 cases of imaging fusion), participated in this study. They performed more than 10 cases of RFA or biopsy with automatic registration for 3 months before enrolling patients to get used to the new automatic registration technique.
The RS80A US system (Samsung Medison, Seoul, Korea), which is capable of fusion imaging (S-Fusion, Samsung Medison) was adopted for automatic registration. The LOGIQ E9 US system (GE Healthcare), which is also capable of fusion imaging (Volume Navigation, GE Healthcare) was adopted for manual registration. These US systems were coupled with a magnetic field generator. Two electromagnetic position sensors were connected to a position sensing unit and were attached on a convex-type ultrasound transducer using a bracket. Both the transmitter and sensors were connected to a fully integrated position sensor unit embedded in the US unit (Ascension Technology, Shelburne, VT, USA). For the LOGIQ E9 US system, an active patient tracker (OmniTrax, CIVCO Medical Solution, Kalona, IA, USA) was attached on the left anterior chest wall of the patient to correct patient motion.

US examinations of the lower extremity were performed using an iU22 ultrasound system (Philips Healthcare, Bothell, WA, USA) with a L5-12 probe or LOGIQ E9 US system (GE Healthcare, WI, USA) with a ML6-15 probe. The examined lower extremity bursae included the bilateral suprapatellar bursa (SPB), deep infrapatellar bursa (DIPB), popliteal bursa (PB), and retrocalcaneal bursa (RCB). All US scans were conducted by two physicians (Chi-Qiu Wu and Lei Zhang) with more than 5 years of musculoskeletal US experience each.
US examinations of the SPB and DIPB were performed with the subjects sitting with both knees flexed at 30°.[9 (link)] The probe was placed at the knees longitudinally above the patella, and the SPB could be detected between the quadriceps tendon and femur with two fat pads surrounding it. While the probe was placed longitudinally below the patella, the DIPB could be found between the patellar tendon and tibia. The PB and RCB were scanned in a prone position with the legs keeping straight. The PB could be observed between the semimembranosus muscle and the medial head of the gastrocnemius muscle when the probe was placed horizontally below the popliteal fossa. The RCB could be detected longitudinally in the rear between the Achilles tendon and the posterior–superior corner of the calcaneus.

Bilateral morphologic US measurements were obtained. Each participant was placed in a supine position with a wedge immobilizer under the evaluated knee to maintain a constant 20° of knee flexion (Figure 1A), per the American Institute of Ultrasound in Medicine and the American College of Radiology recommendations. US evaluations used a 9-MHz transducer on a LOGIQ E9 US system (GE Healthcare). The imaging physician (O.K.N.) reviewing the US data was blinded to the MRI evaluation.