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Medical Imaging > US > Flashcards

US Flashcards

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USMLE® Step 1 flashcards
1
Q

What generated the US?

A

Piezoelectric crystal and ceramic material

oscillate and produce periodic vibration

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2
Q

US propagation in human soft tissue =

A

1540 m/s

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3
Q

Refraction=

A

Whaen the US beam travels btw. two different medium with an oblique incidence

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4
Q

What can we get when using about 200 US transducer at the same time in the same location?

A

Increased temparture MRI Guided Focused US

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5
Q

Convex probe features

A

3.5-5.5 MHz
Good penetration
Lower resolution

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6
Q

Linear probe features

A

8-5
Poor penetration
Higher resolution

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7
Q

Which other US probes do you know?

A

TEE
Phase array (cardio)
Laparoscopic
Pencil

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8
Q

What is the simplest mode of US?

A

A mode

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9
Q

When do we use M mode?

A

Cardiology mostly

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10
Q

M mode=

A

shows the reflecting echoes position’s change over time along a single US beam

Motion as function of time

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11
Q

Which mode of US is used usually?

A

B mode

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12
Q

In Doppler, when the source of the sound is approaching-
The pitch is Lower/Higher
The wavelength is Longer/Shorter

A

The pitch is Higher

The wavelength is Shorter

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13
Q

Different Doppler modes (4)

A

Color
Contineous (CW)
Pulse (PW)
Power

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14
Q

Flow towards the trancducer will be what color?

A

Red

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15
Q

Blue on Doppler indicated

A

Flow is away from the trancducer

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16
Q

What is contineous Doppler good for?

A

It can make very high velocity measurable

17
Q

What is Power Doppler used for?

A

To display flow without directional information

18
Q

How can we measure soft tissue elasticity and stiffness?

A

Sonoelastography

19
Q

Stiffer structure will be in what color?

A

Blue

20
Q

Softer structure will be in what color?

A

Red

21
Q

2 types of elastography

A
  1. Static, with compression- Strain elastography

2. Dynamic, newer- Shear wave elastography

22
Q

Where should we look for free abdominal fluid on US exam?

A 
Perihepatic space
Hepatorenal recess
Splenorenal recess
Rectovesical recess (Male)
Douglas pouch (Female)
Ileocoecal region
23
Q

Hepatorenal recess is laso called

A

Morisons’s pouch

Medical Imaging (11 decks)

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