Deep bleeder acoustic coagulation (DBAC)—Part I: development and in vitro testing of a research prototype cuff system

Table 2 Summary of in vitro therapeutic power (MinTD) results

Phantom	Cluster position	Cluster depth (cm)	Number of Tx tiles	HIFU focus (offset relative to center of cluster) (mm)			Input acoustic power (W)	Focal intensity (W/cm²)^a	∆T (°C)
Phantom	Cluster position	Cluster depth (cm)	Number of Tx tiles	X	Y	Z	Input acoustic power (W)	Focal intensity (W/cm²)^a	∆T (°C)
7.5 cm	Lower	3.75	2	−0.08	0.26	0.11	57.2	316	45–47
7.5 cm	Middle	3.75	2	0.04	0.01	−0.02	56.4	316	49
15 cm	Lower	5.5	3	0.55	−0.32	−0.83	98.2	316	39–55
15 cm	Middle	4.5	3	0.21	−0.06	−0.05	83.8	316	48–51
15 cm	Upper	7.5	2	NA	NA	NA	93.8	316	57–65^b
15 cm	Lower (B)	7.5	2	NA	NA	NA	83.9	316	35–42
25 cm	Lower	12.5	3	0.12	−0.33	−0.3	167.0	316	43–49
25 cm	Middle	8.0	3	−1.7	1.2	0.48	168.4	316	16–45^c
25 cm	Middle (B)	8.0	3	−0.74	−0.44	−0.02	144.7	316	42–48
25 cm	Upper	5.0	3	−0.61	−0.04	1.0	134.0	316	55–62^d

NA coordinates not available due to data recording error
^aIntensity value spatially averaged over focal dithering pattern cross-section for each Tx beam focus then derated for attenuation along each beam path for beams; Intensities for all foci then superposed
^bAtypical curve shape with enhanced echogenicity observed in the TMM around the cluster
^cCoordinate value entered incorrectly
^dStrong oscillation present in TC readings; possibly indicating viscous heating artifact (see Fig. 16d above)

ISSN: 2050-5736