chpt 16 " dynamic range" physics

• - method of reporting the extent to which a signal can vary & still be accurately measured.

• - reported in units of decibels (dB) , a comparison, a relative measurement , or ratio between largest & smallest signals that are measured accurately

• dynamic range

• threshold

• narrow dynamic range, high contrast, black & white(bistable)

• wide dynamic range, low contrast, gray scale

An uncompressed signal within the receiver of an ultrasound system has a dynamic range of 110 dB. The signal undergoes 40 dB of compression. What is the dynamic range of the compressed signal?

• 70dB

• -70dB

• 110dB

• 40dB

• undetermined

Answer explanation

if its already uncompressed and it undergoes compression just subtract the initial dynamic range from the dynamic range after it was compressed

• 110dB - 40dB = 70dB

the archive has a dynamic range of

• 120dB

• 100 -120dB

• 40 - 50dB

• 20 - 30dB

• 10 - 30dB

narrow dynamic range, high contrast, black & white(bistable) can be defined as ?(A)

• • - method of reporting the extent to which a signal can vary & still be accurately measured.

  • - reported in units of decibels (dB) , a comparison, a relative measurement , or ratio between largest & smallest signals that are measured accurately

• weak signals are below the systems _____

• • Images that display many shades of gray

• fewer shades of grey , image; that is, one that contains only black and white

the dynamic range of 20-30dB is related to ________ component

• transducer

• receiver

• scan converter

• display

• archive

the display has a dynamic range of

• 120dB

• 100 -120dB

• 40 - 50dB

• 20 - 30dB

• 10 - 30dB

Match the following

Groups:

(a) fewer shades

,

(b) more shades

• few choices

• low contrast

• high contrast

• black & white(bistable)

• wide dynamic range

• narrow dynamic range

• many choices

• gray scale

the receiver has a dynamic range of

• 120dB

• 100 -120dB

• 40 - 50dB

• 20 - 30dB

• 10 - 30dB

the transducer has a dynamic range of

• 120dB

• 100 -120dB

• 40 - 50dB

• 20 - 30dB

• 10 - 30dB

A signal within a system's receiver has a dynamic range of 60 dB after compression. The original signal was compressed by 50 dB. What is the dynamic range of the original, uncompressed signal?

• 60dB

• 50dB

• 110dB

• 10dB

• -10dB

Answer explanation

all you do is check to see if its already been compressed (which it has) so the dynamic range is at 60dB , its telling you it was originally compressed by 50dB which means if you add them together you'll figure out the original signal

60dB + 50dB = 110dB