Chapter 20: SPI Study Guide

Why is there no color in Image A?

• Since the cosine is 0 degrees, no Doppler shift is created or measured, and no color appears in the vessel.

• Since the cosine is 60 degrees, no Doppler shift is created or measured, and no color appears in the vessel.

• Since the cosine is 90 degrees, no Doppler shift is created or measured, and no color appears in the vessel.

• Since the cosine is 180 degrees, no Doppler shift is created or measured, and no color appears in the vessel.

Having an angle other than 90 degrees must be created between the direction of flow and the direction of the sound beam. What will this create?

• Pulse wave Doppler

• Color Wave Doppler

• Decrease the flow in the vessel

• Increase the flow in the vessel

What is going on with the color box in Images B and C?

• Box is steered. The flow and sound beam is different than 90 degrees

• Box is steered. The flow and sound beam is 90 degrees

• Box is steered. The flow and sound beam is different than 0 degrees

• Box is steered. The flow and sound beam is different than 180 degrees

Other than changing the angle, is there an alternative action that will make color appear in the vessel?

• Yes, change the flow and sound beam direction

• Yes, the box needs to be steered

• No, color won't appear if the direction of flow and sound beam is perpendicular

• No, color won't appear if the direction of flow and sound beam is parallel

Why is there no color within the vessel?

• The angle is at 0 degrees, color box steered to the left, slanted vessel

• The angle is at 60 degrees, color box steered to the left, slanted vessel

• The angle is at 90 degrees, color box steered to the left, slanted vessel

• The angle is at 180 degrees, color box steered to the left, slanted vessel

What single control on an ultrasound system can make color appear throughout the color box as shown in Image B?

• The color gain is too low

• The color gain is too high

• The color gain doesn't need change

• The color gain is steered

What is the name of the artifact in Image B?

• Sprinkles

• Color Confetti

• Sparkles

• Twinkles

What single control on an ultrasound system can make color disappear as show in Image C?

• The color gain is set too low

• The color gain is set too high

• The color gain doesn't need any change

• The color box is steered

What alteration was responsible for change in the appearance of the spectrum from Image A to Image B?

• In Image B, decreasing pulse Doppler is set too low. Gray scale noise appears throughout the spectrum when the pulsed Doppler gain is set too low.

• In Image B, pulse Doppler is set too high. Gray scale noise appears throughout the spectrum when the pulsed Doppler gain is set too high.

• There is nothing wrong with Image B

• Image B has the gain setting too high.

What alteration was responsible for the change in the appearance of the spectrum from Image A to C?

• Image C is increasing the pulsed Doppler and the level is too high. Gray scale is disappearing in the image.

• Image C is decreasing the pulsed Doppler and the level is too low. Gray scale is disappearing in the image.

• There is nothing wrong with Image C

• The gain is set too low