Chapter 5

Question 1

__________ may be reported in various ways with respect to time and space.

Answer 1

Intensities

Question 2

The different measurements of intensities are important in the study of

Answer 2

bioeffects.

Question 3

_____ is the most relevant intensity with respect to tissue heating.

Answer 3

SPTA

Question 4

The units for all intensities are _______.

Answer 4

watts/cm^2

Question 5

Because peak measurements are larger than average measurements, _____ intensity has the highest value, and _______ has the lowest value.

Answer 5

SPTP, SATA

Question 6

A number called the ____________ describes the spread of a beam in space.

Answer 6

beam uniformity coefficient (SP/SA factor)

Question 7

The _____ _____ describes the relationship of beam intensities with time.

Answer 7

Duty factor

Question 8

The duty factor is a unit less number with a value between ___ and ____.

Answer 8

0 and 1.

Question 9

For continuous wave ultrasound, the beam is always on and the pulse average and temporal average intensities are the same. Thus, ______ = _______ and ________ = ________.

Answer 9

SPTA= SPPA, SATA=SAPA.

Question 10

_______ ______ ______ is the maximum intensity in time.

Answer 10

Temporal peak intensity.

Question 11

___ intensity is averaged over the most intense half-cycle.

Answer 11

Im

Question 12

______ ________ _______ is averaged only during the pulse duration

Answer 12

Pulse average intensity ( Ipa)

Question 13

_____ ________ _______ is average during the PRP

Answer 13

Temporal average intensity. (Ita)

Question 14

________ ______ _______ is the maximum in space.

Answer 14

Spatial peak intensity. (Isp)

Question 15

______ ________ _______ is averaged over the cross -sectional area of the beam.

Answer 15

Spatial average intensity. (isa)

Question 16

Rank the intensities from largest to smallest.

Answer 16

SPTP—— im———-SPPA——–SPTA——-SATA