phyrev ch.2 - 6 resulting intensities : SPTP, SATP, SPTA,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
6 resulting intensities : SPTP, SATP, SPTA, SATA, SPPA, SAPA SPTA intensity – most important for bioeffects and relevant intensity for tissue heating SPTP intensity – highest value SATA – lowest value When PW and CW have same SPPA intensities, CW has the higher SPTA intensity. When PW and CW have the same SAPA intensities, the CW has the higher SATA intensity Rank or I from largest to smallest : SPTP > SPPA> SPTA> SATA Spatial Peak = is the highest intensity, a focused transducer will have the spatial peak intensity at the focal zone of the beam. Spatial average – Is the average value for intensity in a specified area of the beam, usually at transducer face) Temporal Peak – measurement of max intensity found within a single pulse – measured when pulse attains its greatest amplitude, pulse is on Temporal average – average intensity over a pulse averaged over time when sound is on and off Decibels – logarithmic scale, a ratio of two intensities, powers or amplitudes. A relative scale – ratio of the final to initial strengths. + db - 3 db means 2 times bigger 10 db means 10 times bigger . - db - -3db means ½ -10 db means 1/10 Apply only to powers and intensities. Ch 5 – Interaction of Sound and Media
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/22/2010 for the course ULTRASOUND 729 taught by Professor Barnes during the Spring '10 term at El Centro College.

Page1 / 3

phyrev ch.2 - 6 resulting intensities : SPTP, SATP, SPTA,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online