Magnetic resonance-guided focused ultrasound treatment of facet joint pain: summary of preclinical phase

Table 2 Summary of the average temperature rise and its range

Energy (J)	Average temperature rise measured (°C)	Range (°Ccpa
150	0.5	0.0–3.0
200	0.8	0.8–0.8
300	1.0	0.2–5.2^a
500	0.9	0.7–1.0
1,000	2.2	1.0–3.3

Summary of the average temperature measured at the focal point on the targeted facet joint and the temperature measured in the nontargeted intervertebral foramina located in the far field of the sonication according to the acoustic energy delivered. Temperature measurements displayed in this table were acquired using thermocouples. ^aIn one sonication (with an energy of 300 J), the transducer orientation was such that the foramen was at the center of the acoustic beam in the far field. In this case, temperature rise reached 5.2°C.

ISSN: 2050-5736