Source: https://patents.google.com/patent/US7806839B2/en
Timestamp: 2019-09-17 22:21:47
Document Index: 559608083

Matched Legal Cases: ['Application No. 2002303862', 'Application No. 2002305713', 'Application No. 2002310089', 'Application No. 2002312084', 'Application No. 2002314817', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 04811946', 'Application No. 04814036']

US7806839B2 - System and method for ultrasound therapy using grating lobes - Google Patents
System and method for ultrasound therapy using grating lobes Download PDF
US7806839B2
US7806839B2 US10/867,170 US86717004A US7806839B2 US 7806839 B2 US7806839 B2 US 7806839B2 US 86717004 A US86717004 A US 86717004A US 7806839 B2 US7806839 B2 US 7806839B2
US20050277853A1 (en
Foci ⁡ ( X ) = F ⁢ ⁢ λ ⁢ ⁢ m d Equation ⁢ ⁢ 1
where m=0, ±1, ±2 . . . .
Φ = ⅇ ⅈ2π ⁢ ⁢ n N Equation ⁢ ⁢ 2
Foci = F ⁢ ⁢ λ ⁡ ( m + 1 N ) d Equation ⁢ ⁢ 3
For example, if N=2 in Equation 2, the phase shift between adjacent elements 18 will be 180°, corresponding to a reversal of polarity between elements. As a result, grating lobes will occur approximate positions defined by Equation 4:
Foci = F ⁢ ⁢ λ ⁡ ( m + 1 2 ) d Equation ⁢ ⁢ 4
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