Ch 23 Extraoral & Digital Radiography

Which of the following is considered extraoral film?

panoramic radiograph and cephalometric radiograph

A cassette is used to

hold the film for extraoral radiographic exposures

All of the following are true statements about the panoramic exposure techniques except

the film is placed in the patient's mouth and the patient gently closes on the film

All of the following are seen as radiopaque structures on dental x-rays except

pulp chamber

Which of the following radiology techniques is used mainly for diagnosis of TMJ?

magnetic resonance imaging

____ allows the dentist and/ or dental assistant take x-rays and then display the image on a computer monitor

digital radiography

All of the following are part of direct digital imaging systems except

duplicating film

All of the following are true statements about 3-D imaging systems except

uses standard periapical film

Dental assistants are allowed to diagnose dental disease by interpreting x-rays.

This is a false statement

With which of the following systems is a scanner used after the x-rays have been exposed?

Indirect digital imaging

Extra oral radiographs are used by the dentist to identify

large areas of the skull on a single radiograph, both maxillary and mandibular areas at the same time, conditions or artifacts that are not otherwise diagnosed in other ways

Panoramic radiographs may be taken of

patients who have trismus, patients in wheelchairs, edentulous patients

All of the following are extraoral radiographs except_____ radiographs

periapical

All of the following might cause a ghost image except

caries

The cephalometric radiograph records

sinuses, implant evaluation, TMJ assessment

A cephalometric unit consists of all the following except a

bite block

The line from the tragus of the ear to the floor of the orbit is also called the

Frankfort plane

Which dental specialist uses primarily cephalometric radiographs in practice

orthodontist

The radiographic principle of imaging one section or layer of the body while blurring images from other areas is called?

tomography

What positioning error has occurred when taking a panoramic radiograph if the anterior teeth appear blurred and the spine appears superimposed over the ramus areas of the mandible?

patient is positioned to far forward

What positioning error has occurred when taking panoramic radiograph if a dark radiolucent area appears above the apices of the maxillary teeth

patients' tongue was not resting on the roof of the mouth

When visualized on a radiograph, which term best describes the dense compact bone that forms the tooth socket?

cortical plate

When visualized on a radiograph, which term best describes the compact edge of the cortical bone that shows as radiopaque between teeth

alveolar crest

When visualized on a radiograph, which term best describes the process of the temporal bone that lies in the lower anterior section behind the ear

mastoid

What imaging technique is mainly used to diagnose TMJ disease

MRI (magnetic resonance imaging)

Which type of imaging technique is storage phosphor imaging

indirect digital imaging

_______ is the merging of multiple images that were taken at different times to revel features that changed in any one of the images

digital subtraction

What type of imaging unit is Cone Beam Volumetric Imaging?

three-dimensional imaging

What is the type of imaging is most often used when planning implant surgery?

computed tomography

When visualized on a radiograph, which term best describes the radiolucent area on the lingual side of the mandible at the midline

lingual foramen

Which of the following features of digital radiography can radiographic image display?

digitized

sent to another office by fax or modem

enhanced

When conventional x-ray machine is used with digital radiography, the x-ray machine should be capable of producing ____ kV

70

The following are disadvantages of digital radiography EXCEPT

capability to enhance, contrast, zoom in on and image from chairside

The ___ is one of the most widely used image receptors in dental digital radiology

CCD