Trivia 1

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Trivia 1

Increasing beam width in CT will

2 points

Increase motion

Increase scan time

Decrease partial volume artifact

Not affect dose

Clear selection

Breast shields usage is recommended for

2 points

Scout images

CT Calcium scoring

Neither

Clear selection

Decreasing helical CT detector width will _____ CT dose efficiency due to ______

2 points

Increase, overranging

Decrease, overbeaming

Increase, overranging

Decrease, overranging

Clear selection

____________ is light emitted from screen and measured by _________

2 points

Luminance, lumen/m2

Illuminance, lumen/m2

Luminance, candela/m2

Illuminance, candela/m2

Clear selection

The main interaction of Barium with x-ray is

2 points

Compton

Coherent

Clear selection

________ annihilates B plus. __________ annihilates B minus

2 points

Neutrino, Antineutrino

Negatron, Neutrino

Antineutrino, Negatron

Antineutrino, Neutrino

Clear selection

Slice selection in MRI can only be done

2 points

Vertically

Axially

Transversely

Any plane

Clear selection

_________ coils can send and receive pulses. _______ coils can only send

2 points

Gradient, RF

RF, Gradient

Clear selection

In the diagnostic range, the concern for dosing the fetus is primarily

2 points

Cancer risk

Congenital malformations

Both

Clear selection

Focal spot narrows with _______ Kv and _______ mA

2 points

High, high

Low, low

Low, high

High, low

Clear selection

Mammography images are _____. CT images are _____

2 points

8 bit, 12 bit

12 bit, 8 bit

Both 12 bit

Both 8 bit

Clear selection

High LET radiation biological effects depend on

2 points

Cell type

Oxygen level

Dose rate

Isoeffect

Clear selection

Screening Chest CT dose equals about _____ CXRs

2 points

100

Clear selection

CT head has high _______ dose. CT Abdomen has high ______ dose

2 points

Skin, effective

Effective, skin

Scatter, skin

Fetal, effective

Clear selection

Given constant scan parameters, CTDIvol for an obese patient is ________ in comparison to a thin patient

2 points

Higher

Lower

Same

Clear selection

According to the Rose Criterion, an SNR of ____ is required to detect objects

2 points

Clear selection

Backscatter increases skin dose by

2 points

Clear selection

Thallium cardiac imaging relies on

2 points

B minus

B plus

Gamma

Hg 201 characteristic x-rays

Clear selection

Which source is a bigger contributor to public exposure?

2 points

Radon>CT> Nuclear medicine

CT> Nuclear medicine>Radon

CT> Radon>Nuclear medicine

Clear selection

CXR effective dose is higher for PA than AP

2 points

True

False

Clear selection

Susceptibility MRI utilizes ______________ to increase contrast

2 points

Phase information only

Magnitude information only

Either

Both

Clear selection

Beta emitters are always labelled as

2 points

White 1

Yellow 1

Yellow 2

Clear selection

For a head CT, the critical organ is

2 points

Globe

Lens

Pituitary gland

Thyroid gland

Amygdala

Clear selection

CO2 visibility is ________ with higher Kv. Iodine visibility is _____ with higher Kv

2 points

Increased, increased

Decreased, decreased

Increased, decreased

Decreased, increased

Clear selection

What will increase Doppler sensitivity?

2 points

Decrease scale

Increase scale

Increase wall filter

Increase wall filter and decrease scale

Clear selection

The limiting spatial resolution is the frequency at which MTF drops to ______

2 points

10%

25%

50%

Clear selection

In T1 and PD, large ETL causes more T2 weighting of images, therefore shorter turbo factors must be used

2 points

True

False

Clear selection

At high Gd concentration, T2 ________ dominates as seen in the bladder or MR arthrogram

2 points

Prolongation

Shortening

Resonance

J-coupling

Clear selection

Moire artifact can be managed by all of the following, EXCEPT

2 points

Smaller FOV

Use GRE sequences

Use less Tesla

Shimming

Clear selection

_________ affect scan time

2 points

Both TR and TE

Clear selection

CT is regulated by

2 points

State

FDA

NRC

State and FDA

State and NRC

FDA and NRC

Clear selection

Occupational exposure is regulated by

2 points

State

FDA

NRC

State and FDA

State and NRC

FDA and NRC

Clear selection

I-131 is regulated by

2 points

State

FDA

NRC

State and FDA

State and NRC

FDA and NRC

Clear selection

TGC is US is

2 points

Linear

Exponential

Quadratic

Varies by detector type

Clear selection

Increasing slice thickness will _________ dose in CT and _______ scan time in MRI

2 points

Increase, increase

Increase decrease

Decrease, increase

Not affect both

Clear selection

In CT, increasing Kv will decrease all of the following, EXCEPT

2 points

Noise

HU measurements

Iodine conspicuity

Dose

Clear selection

Increasing slice thickness will _________ scan time in CT and _______ scan time in MRI

2 points

Increase, increase

Increase decrease

Decrease, not affect

Not affect both

Clear selection

Geometric magnification will ___________ spatial resolution

2 points

Always increase

Always decrease

Decrease or increase

Not affect

Clear selection

Electronic magnification will ___________ spatial resolution

2 points

Always increase

Always decrease

Decrease or increase

Not affect

Clear selection

Magnetization Transfer Ratio (MTR) MRI is used in multiple sclerosis patients

2 points

True

False

Clear selection

Mechanical Index reduction can be achieved by using _______ focal zone

2 points

Deep

Shallow

Variable

Clear selection

____________ is dose as a function of slice thickness. _________ is actual thickness in relation to indicated thickness

2 points

Dose sensitivity profile, Slice sensitivity profile

Exposure index, Slice index

Dose index, Slice sensitivity profile

Clear selection

Translational movement in CT is relevant to

2 points

1st generation

2nd generation

3rd generation

4th generation

1st and 2nd generation

2nd and 3rd generation

Clear selection

In an atom, as the number of protons increases, the number of electrons will _______

2 points

Increase

Decrease

Not change

Clear selection

US grayscale compression will _________ contrast

2 points

Decrease

Increase

Not affect

Clear selection

Speckle artifact can be eliminated with changing the transducer

2 points

Position

Orientation

Position and/or orientation

Clear selection

Drop-out artifact in US is due to

2 points

Poor transmit gain

Frequency shift

Lack of tissue coupling

Detector malfunction

Clear selection

Exposure index is optimally

2 points

High

Low

Zero

Varies by study

Clear selection

In SE sequence, the phase encoding gradient should be applied at

2 points

TE/2

TE/4

Clear selection

IR reference point underestimates dose on lateral projection

2 points

True

False

Clear selection

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