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Z-Medical Imaging > Midterm > Flashcards

Midterm Flashcards

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USMLE® Step 1 flashcards
1
Q

ALARA principal

A

ALARA stands for “as low as reasonably achievable”. ALARA means avoiding exposure to radiation that does not have a direct benefit to you, even if the dose is small

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1
Q

Radiography image on either film or digital x-ray will show fat as…

A

dark grey

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2
Q

All statements regarding Computer Tomography are true except…

A

Cross sectional images are not obtained with the use of x-ray

Other Answers:
x-ray and detectors rotate around the patient

High density object appears as high attenuation

Contrast material is used to enhance structure imaging

Low density objects appear as low attenuation

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3
Q

Scintigraphy utilizes…

A

Gamma radiation to form images after the injection of various radiopharmaceuticals.

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4
Q

Magnetic Resonance signal will vary according to the properties of the tissue/ structures being examined, except for…

A

Rebound fragmentation of the sound wave being received by the antenna

Other Answers:
Proton density of the tissue

Chemical environment of the hydrogen

Flow of fluids

T1 rate of return

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5
Q

Regarding Functional MRI: Perfusion-weighted imaging, the following statements are correct.

A

contrast material is injected for the evaluation of cerebral blood volume, flow, and transit time of contrast material.

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6
Q

Anaphylactic reactions that associate with Gd-base contrast material include all of the following except…

A

Tarlov Cystitis

Other Answers (which are true):
Hypotension

Bronchiospasm

Cardiac Arrest

Urticaria

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7
Q

Radiography image on either film or digital x-ray will show soft tissue as…

A

light grey

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8
Q
A
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9
Q

Chest X-Ray (CXR) PA in an erect position best permits evaluation of…

A

cardiac size

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10
Q

Abdominal X-ray is the equivalent to flying at 12,000 meters for …

A

150 hours

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10
Q

Computer Tomography primary investigates all the following except…

A

Tissue with elevated Glucose Metabolism

Other Answers (which are true):
Facial Trauma

Chest Trauma

Detection of Pulmonary Metastases

Cerebral Artery Aneurysm

Cerebral Artery Embolism

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11
Q

One hours ago, a 56 year old male has an onset of right side headache, spatial disorientation and left upper extremity weakness. Which is the most appropriate imaging method?

A

CT scan

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12
Q

Which of the following are not a form of contrast material used in x-ray or ultrasound imaging?

A

2-deoxyglucose labelled with fluorine-18

Other Answers (which are correct):
iodine

Barium

Micro bubble injection

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13
Q

The benefit of Magnetic Resonance Imaging is that it…

A

does not use radiation

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14
Q

Magnetic Resonance Imaging utilizes large electromagnets and RF coil to perform all the following except

A

evaluate tissue density, through electron penetration and RF coil frequency antenna reception.

Other Answers (which are true):
Analyze the volume of hydrogen molecules in the body’s tissue to evaluate anatomy and physiology

align hydrogen atom’s proton to a parallel or anti-parallel to the magnetic field.

align the hydrogen atom’s proton in the transverse plane.

apply a radiofrequency excitation pulse to hydrogen molecules in the body.

15
Q

Which diagnostic method for Magnetic Resonance is the most often prescribed?

A

brain

16
Q
A

MRI T2

-water is white

17
Q

Choose the correct statement for T1-weighted Magnetic Resonance Images.

A

Fat appears as white

18
Q

Magnetic Resonance Imaging of the brain is indicated for the following conditions except

A

Acute Cerebral Vascular Accident

Other Answers which are true:
Tumor

Seizures

Multiple Sclerosis

Intracranial Infection

19
Q

Functional MRI method of FLAIR (FLUID-ATTENUATED INVERSION RECOVERY) provides images that…

A

Suppresses Cerebral Spinal Fluid to improve viewing of the periventricular hyper-intense lesions

20
Q

Which of the following statements is true regarding SPECT (Single Photon Emission Computer Tomography)

A

Highly sensitive imaging that produces two-dimensional images by analyzing the release of gamma rays from radionuclide’s release of photons from radiopharmaceuticals, once injected into a body.

21
Q

Which radiopharmaceutical has use in bone scintigraphy?

A

99mTc-Technetium (MDP or HDP)

22
Q

Which radiopharmaceutical has a use in Thyroid scintigraphy?

A

99mTc- Technetium (pertechnetae)

23
Q

Which of the following statements is correct? Positron Emission Tomography…

A

Utilizes FDG to view tissue with high metabolic rate Views positron emissions with a multiple photon collecting gamma camera

24
Q
A

A

25
Q

Myocardial Perfusion utilizes 99mTc-sestamibi (MIBG) to …

A

Assess how well blood flows through cardiac muscle

26
Q
A

Z-Medical Imaging (2 decks)

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