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MSK: Gross Anatomy Exam 1 > Intro to Medical Imaging > Flashcards

Intro to Medical Imaging Flashcards

1
Q

MOST IMPORTANT LOS

Differentiate imaging modalities that use X-rays for image production

Describe the differences between an AP and PA plain film radiograph

Explained how computed tomography builds upon plain film

Hounsfield scale

MRI

Ultrasonography; huge now…that’s it

A
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2
Q

X-rays (photons) from the ___________ pass through the body to expose the recording plate

A

Tungsten Target

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3
Q

The greater the attenuatinon or absorption of the photons by tissues = ____________?

A

Whiter the density

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4
Q

Organs with air will appear _______

A

Dark

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5
Q

Barium is used as a contast agent in the :

A

GUT

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6
Q

Iodine is used as a contast agent in the :

A

Brain

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7
Q

Describe the view of the left image and the right image

A

Left: PA

Right: AP

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8
Q

What is Fluoroscopy?

A

Continuous stream of X-ray to view structures in real time

Used for barium contast studies

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9
Q

What is digital subtraction (DS) angiography?

A

Form of fluoroscopy

“Subtract tissues” from what you want to see

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10
Q

What is computed tomography (CT)?

A
  • Take images and adjust the gray scale to pull out certain tissues
  • CT are generated w/ X-rays passing through the body in helical fashion
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11
Q

How are you looking at a CT?

A

Feet up

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12
Q

What is the Hounsfield Scale?

A

Zero=water

Air= -1000

Compact bone= +3095

Soft tissues = (-100) to (+100)

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13
Q

What is the window level?

A

Number on hounsfield scale set to middle gray

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14
Q

ADD REMAINDER OF HOUNSFIELD SCALE

A
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15
Q

What are CTs useful for imaging?

A

Bone

Chest and abdomen organs/pathology

Blood vessels

Intercranial bleeding

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16
Q

What is Magnetic Resonance Imaging?

A

Utilizes nuclear spin

As they return to equilibrium, the radiofrequency energy emitted by protons during “RELAXATION TIME” can be measured

17
Q

Fluid is _______ in T1

A

DARK

18
Q

Fluid is _______ in T2

A

LIGHT

19
Q

What is the difference b/w T1 and T2?

A
20
Q

Note the examples of T1/T2

A
21
Q

What are MRIs useful for?

A
  • No ionizing radiation
  • Better soft tissue contrast than CT
  • Extremly versatile
22
Q

Disadvantages of MRI?

A
  • Long time
  • Expensive
  • Pt. cannot have metal in body
  • Not good for claustophobic pts.
23
Q

GENERALLY what is nuclear medicine imaging?

A

Measures physiological activity rather than anatomy

24
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34
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MSK: Gross Anatomy Exam 1 (12 decks)

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