radiology q7

Which of the following imaging modalities produces images without the use of radiation?

-X-ray

-CT

-Ultrasound

-Fluoroscopy

Ultrasound

The appearance of tissues on ultrasound, based on the ability of the tissues to reflect sound waves is

Echogenecity

If the tissue of interest reflects back more intense sound waves and appears brighter than the tissues surrounding it, the term used is

Hyperechoic

What happens to crystals within the ultrasound transducer when strong, short electrical pulses strike them?

They vibrate

Which of the following frequencies will allow for the deepest level of penetration in ultrasound?

-4 MHz

-8 MHz

-6 MHz

-10 MHz

4 MHz

Approximately how many shades of gray are incorporated into the display of an image obtained through ultrasound?

256 shades of gray

The fluoroscope is an adaptation of a radiography unit used to

Provide dynamic real-time imaging

High doses of radiation possible during fluoroscopy if

The operator does not pay attention to the timer

Regarding fluoroscopy, the image on the intensifier screens

is enhanced when the human eye is correctly dark adapted

Application of fluoroscopy are

Real-time imaging of orthopedic surgery and function of the gastrointestinal system

What determined the slice thickness on the CT scanner?

-The predetector collimators

-All of the choices are correct

-The prepatient collimators

-The technician's choice

All of the choices are correct

Which is true for CT scans over traditional x-rays?

Require a higher kV and higher mAs

Modern CT scanners use multislice technology and are able to acquire image slices thinner than which of the following sizes?

-10cm

-10mm

-1cm

-1mm

1 mm

What must be done for every person or patient entering into an MRI room?

A screening form must be filled out to check for implants or operations and all loose metallic objects need to be removed

What happens to atoms when they are placed in a magnet?

The reposition themselves with regard to their magnetic polarity

For which atoms are MRI radio frequencies tuned to in order to create images?

Hydrogen

Why is the word resonance used in the term MRI?

It is the manner in which the atom's magnetic fields respond to a radio frequency

The science that makes use of radioisotopes for diagnosis is

Nuclear scintigraphy

During a nuclear medicine procedure, the equine patient

Stands quietly while its body emits radioactive signals

Once the horse has been injected with the isotope then

It is then radioactive and needs special handling

The nephrogram phase of an excretory urogram shows the

Vascular supply and perfusion of the kidneys and should be taken immediately

The contrast agent solution is completely insoluble, radiopaque, and physiologically inert. Which contrast agent are we referring to?

Barium

You have just administered barium via gastric gavage to a cat. For a full study, it is best to take the radiographs

immediately at 15, 30, 60 and 90 minutes and then hourly until completed

The primary function of the large-barium impregnated polyethylene spheres is to

Detect gastrointestinal tract obstructions

The most appropriate contrast medium for a positive-contrast cystogram in dogs is

Iodinated water-soluble liquid

What does BART stand for?

Blue Away Red Towards

What does PET stand for regarding nuclear medicine?

Positron emission tomography