Question 1

Identify the film that will reduce the most radiation exposure.

Accepted Answer

D

Question 2

The lead-foil backing is included in the intraoral film packet:

Accepted Answer

The lead-foil backing is included in the intraoral film packet to absorb back-scattered radiation. This prevents the radiation from reaching and exposing other areas of the film.

Question 3

All of the following may cause film fog EXCEPT one.Which one is the EXCEPTION?

Accepted Answer

Emulsion of silver halide actually forms the image on the film, and is necessary for proper exposure and development. Exhausted processing solutions, improper safelight conditions, and unprotected storage of films can all cause film fog by exposing the film to unwanted light sources.

Question 4

When the x-ray photons strike the phosphors of the intensifying screen light,photons are produced.

Accepted Answer

When x-ray photons strike the phosphors of the intensifying screen light, photons are produced through a process called scintillation. These photons are then emitted from the screen and contribute to the image formation on the radiographic film.

Question 5

In direct digital imaging,the photostimulable phosphor (PSP)plate is used as the image receptor and consequently is used to produce an instantaneous radiographic image.In indirect digital imaging,the sensor is used as the image receptor.

Accepted Answer

In direct digital imaging, sensors like CCD or CMOS are used for instantaneous images, not PSP plates. PSP plates are used in computed radiography, which is a form of indirect digital imaging.

Question 6

Intraoral film packets come in five basic sizes,the higher the designated number,the smaller the film packet.

Accepted Answer

The higher the designated number of an intraoral film packet, the larger the film packet.

Question 7

Film cassettes can be either rigid or flexible.

Accepted Answer

Film cassettes can indeed be either rigid or flexible, with rigid cassettes typically being made of plastic or metal and flexible cassettes being made of materials such as vinyl or rubber.

Question 8

Rare earth intensifying screens differ from calcium tungstate screens in all of the following characteristics EXCEPT one.Which one is the EXCEPTION?

Accepted Answer

Rare earth intensifying screens are faster and require less exposure, must be used with compatible film, and produce green light. The image definition may actually be improved with the use of rare earth intensifying screens compared to calcium tungstate screens.

Question 9

The main advantage of intensifying screens is:

Accepted Answer

Intensifying screens significantly reduce the amount of radiation needed to produce an image on the film, thereby decreasing the radiation exposure to the patient. This is because the screens amplify the effects of the X-ray photons, making it possible to obtain the necessary diagnostic information with lower doses of radiation.

Question 10

Taking films to be duplicated out of the mounts:

Accepted Answer

Taking films out of the mounts for duplication can improve the detail of the duplicates because it allows for closer contact between the original and the duplicating film, reducing the potential for loss of detail that can occur when duplicating through mounts.

Question 11

Duplicating film does not have an orientation dot on the emulsion to identify the patient's right or left side.Intensifying screens do not have an orientation dot on the screen to identify the patient's right or left side.

Accepted Answer

Both statements are true. Duplicating film and intensifying screens do not have an orientation dot on them to identify the patient's right or left side. It is the responsibility of the technologist to ensure that the correct side is labeled on the film or cassette during the imaging process.

Question 12

The dental x-ray film packet is composed of all of the following EXCEPT one.Which one is the EXCEPTION?

Accepted Answer

The outer wrapper of a dental x-ray film packet is typically made of paper, not plastic.

Question 13

Film speed is determined by all of the following EXCEPT one.Which one is the EXCEPTION?

Accepted Answer

Film speed is not determined by the fluorescence coating. Film speed refers to the film's sensitivity to light and is determined by the thickness of the emulsion, the presence of radiosensitive dyes, and the size of the silver halide crystals. The fluorescence coating is used to enhance the image quality by allowing more light to be absorbed by the film, but it does not affect the film speed.

Question 14

Which of the following is a direct digital sensors used in dental digital imaging?

Accepted Answer

Charge-coupled devices (CCDs) are direct digital sensors commonly used in dental digital imaging to capture and convert X-ray images into digital form.

Question 15

The plot of film density versus exposure time is called a H & D curve.

Accepted Answer

This is correct. The H & D curve is named after the inventors of the film densitometer, Hurter and Driffield, and shows the relationship between the density of the developed film and the amount of exposure it received during the shooting process.

Question 16

All dental radiology film have an orientation dot on the white side of the film.This convex-concave area indicates the side of the film that should be facing the tooth.

Accepted Answer

Both statements are accurate. Dental radiology films indeed have an orientation dot, which is used to determine the correct positioning of the film in relation to the tooth. The convex-concave area around the dot indicates the side that should face the tooth during exposure.

Question 17

In indirect digital imaging,the sensor is used as the image receptor.

Accepted Answer

In indirect digital imaging, a photostimulable phosphor plate is used as the image receptor, which is then scanned to produce a digital image.

Question 18

Duplicating film:

Accepted Answer

The answer of Duplicating film:
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Question 19

A double film packet requires more exposure time than the single-film packet.This increases the overall x-radiation exposure to the patient.

Accepted Answer

Both statements are true because a double film packet, containing two films, requires more exposure time to ensure both films are adequately exposed. This increased exposure time results in a higher overall x-radiation dose to the patient.

Question 20

A film that has been fogged will have:

Accepted Answer

Fogging in radiography refers to the unwanted exposure of the film to radiation, leading to overall darkening of the image and a decrease in contrast between different structures. Therefore, a film that has been fogged will have decreased contrast.

Quiz 4: Image Receptors