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Table 1 Exposures used for renal parenchyma treatment

From: Focused ultrasound to displace renal calculi: threshold for tissue injury

Threshold intensity at normal duty cycle Threshold intensity if on continuously Sensitivity to duty cycle at maximum prototype intensity
3.3% Duty cycle 100%Duty cycle ISPPA.3 = 9,320 W/cm2
ISPPA.3(W/cm2) Samples ISPPA.3(W/cm2) Samples Duty cycle(%) Samples
0 29 0 13 0 13
930 12 470 3 2 7
2,530 14 930 6 6 5
4,090 10 2,530 7 10 8
6,030 10 4,090 8 25 3
9,320 12 6,030 5 50 5
12,230 11 9,320 4 100 4
16,620 14     
21,000 11     
26,130 10     
  1. Exposures were based on the expected clinical exposure parameters (3.3% duty cycle), maximum duty cycle (100%) of clinical device, and for a range of duty cycles at an intensity with similar peak positive and negative pressures as the clinical device. The samples represent the number of tissue samples evaluated for injury at each condition.