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Medical Imaging > Oral exam > Flashcards

Oral exam Flashcards

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USMLE® Step 1 flashcards
1
Q

US propagates in the soft tissue at what speed

A

1540 m/s

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2
Q

Convex probe=

A

3.5-5 MHz

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3
Q

Example for anechoic structures

A

Blood
CSF
Urine
Cyst

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4
Q

How will you describe Hemangioma on US

A

Hyperechoic

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5
Q

Simples US mode

When is it used

A

A

Opthalmology

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6
Q

M mode is for

A

Motion

Position change over time

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7
Q

Different Doppler modes

A

Color
Contineous
Pulse
Power

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8
Q

Microrbubbles are eliminated through the

A

Lungs

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9
Q

on sonoelastography, stiffer structures are what color?

A

Blue

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10
Q

Types of elastography

A

Static

Dynamic

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11
Q

US guided procedures

A

FNA of the thyroid……

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12
Q

Gallstone on US

A

Anechoic bcs it it a cystic structure

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13
Q

Define an isotope?

A

Same atomin number

Different mass number

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14
Q

NM can be devided into

A

Conventional NM= SPECT, Tc99m

Diagnosis NM= PET, F18-FDG

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15
Q

Tc99 is absorbed where

A

in the bone in proportion to osteoblast activity

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16
Q

Types of CT image

A

Sequential

Helical

17
Q

HU of different tissues

A 
Air: -1000
Lung: -600
Fat: -60
Water: 0
Soft tissue: +60
Bone: +1000
18
Q

Fresh hematoma on CT is always

A

Hyperdense

19
Q

What is bad about Iodine contrast material?

A

Can lead to acute renal failure

20
Q

What is not a contraindication regarding iodine material

A

Allergy for the iodine antiseptic agent

21
Q

What is the action of Gadolinium?

A

Lower the T1 relaxation time

22
Q

Bad effect of Gadolinium

A

Nephrogenic systemic fibrosis may occure even after couple of months

23
Q

Non malignant tumor of the liver

A

Cavernous Hemangioma

24
Q

Cavernous Hemangioma=

A

Large collections of vascular channels containing slow moving blood

25
Q

Cavernous Hemangioma on US

A

Hyperechoic with post. acoustic enhancement

26
Q

Mediastinum contains

A

Heart
Main vessels
Trachea
Bronchi

27
Q

Mediastinum is devided into

A

Ant
Mid
Post

28
Q

3 main mediastinal pathologies

A

Pneumomediastinum
Mediastinitis
Mediastinal masses

29
Q

When describing a fructure

A

Number of fructure segments
Direction of the fructure line
Relationship btw fragments
Closed/open

30
Q

Fructure in children are classified by

A

Salter Harris classification

31
Q

DD of acute abdomen

A 
Abdominal aorta rupture
Acute pancreatitis
Bowel ischemia
Perforated peptic ulcer
Perforated diverticulitis
32
Q

Imaging methods of acute abdomen

A

US
CT

Abdominal radiograph
Fluoroscopy
MRI

33
Q

Gold standard for kidney stones

A

Low dose CT

34
Q

Most common primary bone neoplasm in adults

A

Multiple Myeloma

35
Q

Types of bone metastasis

A

Osteolytic
Sclerotic
Mixed

36
Q

Osteomyelitis is diagnosed with what modality

A

MRI

37
Q

IBD (2)

A

Crohn’s

Ulcerative colitis

38
Q

Radiology method in case of prostate

A

T2W MRI

Hypointense lesion

Medical Imaging (11 decks)

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