Radiology and Radiography MCQ 1

Bacteria free zone of dentinal caries is

The darkroom worker complains about a new policy that prohibits him from having his lunch in the darkroom. Why was this policy put in place?

In film radiography, the penetrameters are mostly placed:

A cobalt-60 source has a half-life of

Excessive exposure of the film to light prior to the development of the film will most likely result in:

When manually processing films, the purpose for sharply taping hangers two or three times after the films have been lowered in the developer is to:

Pioneer bacteria in dental caries are in

Keep countertop clear of everything not used for loading and unloading cassettes.

The penetrating ability of an X-ray beam is calculated by:

X-ray heat is generated by:

White crescent-shaped marks on an exposed X-ray film are most likely caused by:

Which type of dental X-ray captures a panoramic view of the jaws and teeth in a single image?

Knutson’s technique utilizes?

Linear enamel caries lesions in deciduous teeth predominate in

The darkroom must not have anything above the countertops.

Cobalt-60 used in nondestructive testing emits:

What do the voltage and waveform apply to the X-ray tube by a high-voltage transformer primarily determine?

Reticulation resulting in a puckered or netlike film surface is probably caused by:

What is the primary radiation safety measure used in dental radiography?

An example of particulate radiation is:

From the list of oral microorganisms, which is primarily responsible for the initiation of dental caries?

What is not allowed in the darkroom?

A densitometer is:

What happens if the foil is in direct contact with X-ray film?

Frilling or loosening of the emulsion from the base of the film is most likely caused by:

Which type of intraoral X-ray shows the crown and bone between the teeth in the upper and lower jaw on the same film?

The cathode and anode are parts of an x-ray tube. The anode is negatively charged.

Oral bacterial synthesise extracellular glucans (dextran and mutan) from which host dietary component?

Put the processor operation in the correct order.

Three liquids that are essential to process an exposed film properly are:

What is it called when intensifying fluorescent screens are usually mounted in pairs in rigid holders?

If an exposure time of 60 seconds was necessary using a 4-foot source-to-film distance for a particular exposure, what time would be necessary if a 2-foot source-to-film distance is used and all other variables remain the same?

What is the main advantage of cone beam computed tomography (CBCT) compared to conventional X-rays?

One of the following types of radiation has high Linear Energy Transfer (LET) and hence the potential for more radiation-related tissue damage:

A deficiency of which vitamin has been associated with enamel defects and increased risk of dental caries?

Fixing

The two most common reasons for excessively high-density radiographs are:

Radiographic sensitivity, in the context of the minimum detectable flaw size, depends on:

One of the general rules concerning the application of geometric principles of shadow formation to radiography is:

Which dental structure is visualized best by a periapical X-ray?

In the construction of an X-ray tube, the function of a step-down transformer is to

The best available evidence for an association between amount of sugars and risk of dental caries comes from which type of study design

Rinse

The time required for one-half of the atoms in a specific sample of radioactive material to disintegrate is called:

In order to decrease geometric unsharpness:

As a check on the adequacy of the radiographic technique, it is customary to place a standard test piece on the source side of the specimen. This standard test piece is called a:

Any of the body tissues may be injured by excessive exposure to X or gamma rays, but particularly sensitive are:

In the radiographic principle, “SLOB rule, “the same side movement of the object is ______, and the opposite side movement of the object is ______. What are the missing words in the same sequence?

Passbox is?

Wetting

What does R/hr refer to when talking of intensity:

As the kilovoltage applied to the X-ray tube is raised:

The duration of exposure is usually controlled by:

Which class of drugs used in dentistry may interact with tricyclic antidepressants, potentially increasing the risk of side effects?

70 kilovolts equals

Flasher

Drying

What is the ability to detect a small discontinuity or flaw called?

In order to increase the intensity of X-radiation:

A penetrameter is used to indicate:

Combining a monoamine oxidase inhibitor (MAOI) with foods rich in tyramine may lead to what potentially serious reaction?

The “rotating anode” design in an x-ray tube limits the amount of

Duplicator

Washing

Movement, geometry, and screen contact are the factors that affect radiographic:

Primary radiation which strikes a film holder or cassette through a thin portion of the specimen will cause scattering into the shadows of the adjacent thicker portions producing an effect called:

An intensifying fluorescent screen will

A patient taking aspirin for pain relief is scheduled for dental extraction. Which medication should be avoided due to potential bleeding complications?

An example of an electro-magnetic radiation is

Ventilation system

Step two of the automatic processor operation is: Developing is short but critical.

What is the difference between the densities of two areas of a radiograph called?

Scattered radiation caused by any material, such as a wall or floor, tabletop, or cassette that is located at the back of the film, is known as:

The three main steps in processing a radiograph are:

A patient with hypertension is taking an ACE inhibitor medication. What precaution should be taken when prescribing local anesthetics with vasoconstrictors for dental procedures?

The sharpness of the image is determined to a large extent by the

White lights

Preventive maintenance is required to avoid artifacts and chemical stains on the radiograph

The most widely used unit of measurement to measure the rate at which the output of a gamma-ray source decays is the:

Which of the following materials is suitable for use in vessels or pails used to mix processing solutions:

Lead foil screens are used in radiography:

The “p” in kVp stands for

Safe lights

The four safety precautions for maintenance of the automatic processor are to 1. check replenishment rate and temperature, 2. check solution levels, and what else? Two answers

Who handles the source when doing gamma-ray radiography with high-intensity emitters?

A general rule used to define the amount of radiation exposure that is excessive is:

When the minute silver grains on which the X-ray film image has formed a group together in relatively large masses, they produce a visual impression called.

Which of the following is cariogenic / caries promoting?

Film bin

Always be sure to do maintenance on any broken electrical components.

What happens if a film is placed in a developer solution and allowed to develop without any agitation?

X-ray exposure may be due to:

To prevent excessive backscatter from reaching a radiographic film, one should:

Widely accepted theory of dental caries

What type of film is used with amber filters?

Make sure to perform any routine maintenance before turning off the circuit breaker and on/off switch.

The selection of the proper type of film that needs to be used for the X-ray examination of a particular part depends on:

A general rune often employed for determining the kilovoltage to be used when X-raying a part is:

Static marks, which are black tree-like or circular marks on a radiograph, are often caused by:

Early invading bacteria in carious lesions are called

What type of film is used with red filters?

Do not touch the processor while standing in water.

While radiographing a part that contains a large crack, the crack will appear on the radiograph as:

If a piece of lead 1/2-inch is placed in the path of a beam of radiation emanating from cobalt-60, it will reduce the dose rate at a given location by:

The purpose of agitating an X-ray film during development is to: