Chapter 18: Identifying and Correcting Undiagnosic Radiographs

a

Each of the following statements regarding retake radiographs is correct except one. Which one is the exception?

A) All errors create a need to re-expose the patient.

B) If one radiograph in a set of bitewings is overlapped, it should be determined whether adjacent radiographs image the area adequately.

C) Determining when a retake is necessary will keep radiation exposure to a minimum.

D) All errors reduce the quality of the radiograph.

b

Each of the following would result in a retake radiograph except one. Which one is the exception?

A) Not imaging the correct tooth

B) Imaging 2 mm of supporting bone beyond tooth apices

C) Conecutting the area of interest

D) Imaging a herringbone or tire track pattern

a

Which of the following statements regarding positioning of the image receptor is correct?

A) Absence of apical structures results when the image receptor is not placed low enough in the oral cavity.

B) Inadequate horizontal angulation will result in less of the crown recorded.

C) Excessive vertical angulation will result in overlap error.

D) Not placing the image receptor parallel with the occlusal plane results in conecutting.

c

An image receptor placed too far back in the mouth will result in not imaging the

A) maxillary structures.

B) mandibular structures.

C) anterior structures.

D) posterior structures.

b

A slanted or tilted occlusal plane results from which of the following?

A) Not using a cotton roll to stabilize the image receptor holder

B) Not positioning the edge of the image receptor parallel to the occlusal plane

C) Orienting the image receptor vertically when it should have been oriented horizontally

D) Placing the image receptor in the mouth backward

c

Elongation error results from which of the following?

A) Excessive vertical angulation using the bisecting technique

B) Excessive vertical angulation using the paralleling technique

C) Inadequate vertical angulation using the bisecting technique

D) Inadequate vertical angulation using the paralleling technique

b

Which of the following identifies the cause and corrective action for an image with overlapping of the proximal contacts in which the overlap appears more severe in the posterior region than the anterior region?

A) Mesiodistal projection of the central ray caused the error. Shift the tube toward the anterior to correct this error.

B) Mesiodistal projection of the central ray caused the error. Shift the tube toward the posterior to correct this error.

C) Distomesial projection of the central ray caused the error. Shift the tube toward the anterior to correct this error.

D) Distomesial projection of the central ray caused the error. Shift the tube toward the posterior to correct this error.

c

Light images may result from each of the following except one. Which one is the exception?

A) Placing the image receptor (film) in the mouth backward

B) Not depressing the exposure button for the duration of the cycle

C) Using an mA setting that was too high

D) Developing in weak processing solutions

a

What term is used to describe images other than anatomy or pathology that do not contribute to a diagnosis of the patient's condition?

A) Artifacts

B) Conecuts

C) Double images

D) Pressure marks

b

Overdevelopment results in which of the following?

A) Green areas

B) Dark images

C) White or clear spots

D) Cracked emulsions

c

Failing to record the apical region of the teeth on a periapical radiograph most likely results from an error made in which of the following steps?

A) Placement of the image receptor

B) Horizontal angulation

C) Vertical angulation

D) Centering the x-ray beam

c

Failing to record the incisal or occlusal edges of the teeth on a periapical radiograph most likely results from an error made in which of the following steps?

A) Placement of the image receptor

B) Horizontal angulation

C) Vertical angulation

D) Centering the x-ray beam

d

Conecutting of the radiographic image most likely results from an error made in which of the following steps?

A) Placement of the image receptor

B) Horizontal angulation

C) Vertical angulation

D) Centering the x-ray beam

b

Overlapping of adjacent teeth on the radiographic image most likely results from an error made in which of the following steps?

A) Placement of the image receptor

B) Horizontal angulation

C) Vertical angulation

D) Centering the x-ray beam

d

When using the paralleling technique, excessive vertical angulation will result in

A) elongation of the teeth.

B) foreshortening of the teeth.

C) cutting off the apices of teeth.

D) cutting off the occlusal/incisal edges of the teeth.

b

When using film, the corrective action for a radiograph that displays a "tire track" pattern is to

A) thoroughly clean the rollers of the automatic processor.

B) position film intraorally with the tube side toward the source of radiation.

C) carefully separate the lead foil from the film packet before processing.

D) lower the temperature of the processing chemicals.

b

A clear or blank image indicates that

A) there was an overexposure to radiation.

B) there was no exposure to radiation.

C) a full denture blocked the film from radiation.

D) the image receptor was accidentally exposed to white light.

c

If a film is accidentally placed in the fixer before placing it in the developer, the resultant image will

A) be light.

B) be dark.

C) be blank.

D) have a herringbone pattern.

c

Residual glove powder on the fingers or hands that touches the film results in

A) white marks.

B) pressure marks.

C) black smudges.

D) film fogging.

a

Improper or insufficient washing of radiographic films will result in

A) brown films.

B) green films.

C) black films.

D) white/clear films.

a

True or False? Misuse of a cotton roll to stabilize the image receptor may result in root tips being cut off from the image.

a. True

b. False

b

True or False? The image receptor should be placed with the long dimension horizontal for exposure of anterior periapical radiographs.

a. True

b. False

a

True or False? A herringbone or tire track pattern appears on the image if the film packet was placed in the oral cavity reversed.

a. True

b. False

a

True or False? Elongation error causes the images to appear stretched out.

a. True

b. False

a

True or False? Assembling an image receptor holder with an external aiming device incorrectly may lead to concecut error.

a. True

b. False

b

True or False? A dark image occurs when the developing solution is diluted.

a. True

b. False

a

True or False? A blank film indicates accidental exposure to white light.

a. True

b. False

b

True or False? Formation of a partial image on the radiograph occurs if the developing solution is too weak.

a. True

b. False

b

True or False? White spots on the film are caused by premature contact with the developer solution

a. True

b. False

a

True or False? Dark spots on the film are caused by premature contact with the developer.

a. True

b. False

a

True or False? A light radiograph can result from either underexposure or underdeveloping.

a. True

b. False

a

True or False? A dark radiograph can result from either overexposure or overdeveloping

a. True

b. False

a

True or False? A scratched safelight or incorrect bulb wattage can result in film fog.

a. True

b. False

b

True or False? A white line will appear on a processed film at the point where a film packet was bent or subjected to excessive pressure.

a. True

b. False

b

True or False? a distomesial projection of the x-ray beam results in more severe overlapping in the posterior region of the radiograph.

a. True

b. False

a

True or False? Exposing film to excessive heat and humidity can compromise radiographic quality.

a. True

b. False

a

True or False? Electronic noise is the digital equivalent of film fog.

a. True

b. False

b

True or False? To avoid radiographic error while opening a film packet in the darkroom, the film should be removed from the outer packaging rapidly.

a. True

b. False

b

True or False? If the darkroom door is accidentally opened during unwrapping of the film packets, the resultant image will appear clear, or blank of any image.

a. True

b. False

b

True or False? Bending a phosphor plate will result in a black crimp line.

a. True

b. False