Domain 6: Diagnostic Imaging

Before imaging the coffin bone in horses, which of the following tasks should be performed in preparation?

- Hoof should be trimmed to the new sole level - The horseshoes need to be removed - The sulcus should be packed with radiolucent material

Which of the following factors should all personnel understand about MRI machines?

- No loose metallic objects can be near the machine - It consists of strong magnetic field - The magnet is always on - Every patient/employee should be screened for safety purposes

Which of the following is considered to be a cardinal rule for radiation protection?

- distance - time - shielding

Which of the following image receptors is used in dental imaging?

- film - phosphor plates

Which parts of a patient's body are considered radioactive after they have received the radioisotope?

- skin - hair - waste products

Anything below what Hounsfield unit is displayed as black on CT imaging?

-750 HU

What is the typical wavelength of a medical x-ray?

0.05-0.01 nm

What size of power outlet is required to run a digital dental unit?

110 v

Which of the following Hounsfield units on CT imaging appears as white?

1260 HU

At what age in foals does the closure of the proximal growth plate of P2 occur?

18 - 30 weeks

How long should veterinary facilities maintain dosimetry reports?

30 years

A computer tomography x-ray tube can rotate how many degrees?

360 degrees

When do fetal skeletons of small animals become visible on x-ray?

42 - 45 days

Which repetition time shows the T1 decay response of the tissues using MRI?

546 ms

When using computed tomography, what Hounsfield unit does blood have?

80 HU

Which of the following correctly describes a CT image?

A three-dimensional image and A matrix of voxels

All of the following people are allowed to view individual dosimetry reports, except:

All team members

Which particles have high linear energy transfer (LET) with low penetrability?

Alpha and Beta particles

Which contrast is commonly used for GI studies when perforation is not suspected?

Barium sulfate

How does cerebrospinal fluid appear on a true T1-weighted image of MRI?

Black

Which of the following types of tissue absorb the most radiation?

Bone

Which of the following allows for measurements of very high blood flow velocities in ultrasound?

CW doppler

For a lateral avian view, where would the left wings and limbs be positioned?

Caudally to the right wings and limbs

Which of the following is the best restraint to use in avian radiography?

Chemical restraint

Lead shutters installed in the tube head of the x-ray machine are referred to as:

Collimators

A feature of digital radiography that is related to the bit depth of each pixel and the software that accompanies the digital-imaging system is referred to as which of the following?

Contrast optimization

For an avian lateral view, where should the dependent limb be placed compared to the contralateral limb?

Cranial

Digital radiography, CT, MRI, and ultrasound are stored using a universally accepted format known as?

DICOM

Which of the following best describes the use for Doppler ultrasound?

Doppler is used to image the flow of blood and other liquids as well as to measure their velocity

To obtain a craniocaudal view of the tibia of a small animal, that patient should be in which of the following positions?

Dorsal recumbency

Meters to measure the rate of exposure is also known as:

Dosimeter

Which of the following is not an advantage of digital x-ray versus analog x-ray?

Elimination of damaging radiation

Which of the following will cause a fogged film?

Exposure to excessive scatter radiation

Which type of monitoring badge is the most common method of monitoring ionizing radiation?

Film badges

Which of the following imaging modalities can cause radiation burns if the unit is too close to the skin and remains in exposure mode for too long?

Fluoroscopy

What occurs when the object is not parallel to the recording surface of an x-ray?

Foreshortening

An unossified carpal or tarsal bone describes which grade level on the ossification index for newborn foals?

Grade 1

Which grade level on the ossification index for newborn foals does a closed metacarpal and metatarsal physes describe?

Grade 4

Which of the following locations is best for storing a dosimeter badge?

In a dry, cool place away from the x-ray room

Which of the following is not a form of barium sulfate that can be administered to patients?

Injectable

A grid is a series of thin, linear strips made of alternating radiodense and radiolucent material. Of what are the radiodense strips made?

Lead

Which of the following causes a black irregular border on one end of the film?

Light exposure while still in the box in advance of exposure

To perform an ultrasound in the intercostal region, which transducer would be ideal?

Microconvex probe

For a mediolateral view of the tarsal joint of a horse, the cassette should be placed in which position?

On the lateral surface

Which of the following could cause a false diagnosis of a pneumothorax on a radiograph?

Overexposure of film

Which of the following is the best technique to consider for an abdominal x-ray?

Peak expiration

What is the difference between color Doppler and power Doppler ultrasound?

Power Doppler is sensitive to slow flow and color Doppler indicates direction of flow

In dental radiographs, periapical disease appears as a:

Radiolucent area around the apex of the tooth

For smaller-sized patients, which radiographic technique is preferred?

Tabletop technique

When using color-flow Doppler in ultrasound, what do the displayed red and blue colors mean?

The colors show blood flow; blue indicates flow away, and red indicates flow toward

Decreased radiographic density with poor contrast results from which of the following?

The film was underexposed

Which of the following best describes the term fulcrum?

The point of interest

For standard radiographs of the tarsus of a horse, which of the following is the correct weight distribution?

The weight should be evenly distributed on all four legs

For what are grids used on an x-ray machine?

To decrease scatter radiation and to increase the contrast on the radiograph

What is a concern of exposure creep with the use of digital x-rays?

Unnecessary patient and personnel exposure because of ionizing radiation

A deformity in which the interior angle of the joint, viewed frontally, is greater than 180 degrees is known as what?

Valgus deformity

A deformity, in which the interior angle of the joint, viewed frontally, is <180 degrees, is known as what?

Varus deformity