Radio Chapter 23 & 26

The fact that the cone-beam data has a 1 : 1 relationship with the anatomy means that:

-anatomically accurate images are produced -magnification of measurements does not occur -CBCT eliminates the superimposition of structures

Cone beam computed tomography plays a valuable role in which of the following?

-asses growth & development of the ortho pt -imaging the height & contour of edentulous ridges -treatment planning for implants

Advantages of the CBCT include which of the following?

-mages can be saved digitally in a .jpg or .bmp format -images can be placed on a compact disc media -images can be e-mailed to referring dentists

What size of film is generally used to produce a cephalomateric radiography?

6x12in (15x30mm)

The universal format for handling, storing, and transmitting three-dimensional images.

DICOM data

For which of theses purposes are extraoral radiographs least suitable?

Detection of interproximal caries

The general practitioner is most likely to use which of these extraoral radiographs?

Panoramic

What term describes the crystal used in the emulsion of intensifying screens?

Phosphors

Black artifacts on extraoral radiographs may result from each of the following EXCEPT?

Scratched intensifying screens (white scratch) Black= static, glove powder, rapid removal of film from package

Which technique is used to evaluate position of the condyles & fractures of the zygomatic arch?

Submentovertex

Which of the following projections is best for the examination of fractures of the zygomatic arch?

Submentovertex Projection

Which technique is used for the sagittal view of the lateral surface of the condyle, the articular eminence and to comparie right and left TMJ spaces?

TMJ tomography

A measurement of pixel size in multiplanar reconstruction.

spatial resolution

Unsharp blurry images result from which of the following?

-Film and screens not in close contact - faulty not tight hinge on rigid cassette - not closing the cassette tightly

Which of these is NOT a way to identify extraoral radiographs?

Embossed ID dots

Compared with traditional computer tomography (CT) procedures, cone beam imaging provides a higher radiation dose for the patient.

False

Cone-beam data are said to have a 2:1 relationship with the anatomy.

False

The American Dental Association recognized the specialty of oral and maxillofacial radiology in 2009.

False

Which of the following is used to help reduce film fog during exposure of extraoral radiographs?

Grid

Fast intensifying screen have___ sized crystals and ___ thickness of emulsion.

Large crystals, increased emulsion thickness

Which technique is used for ortho & soft tissue profile?

Lateral Cephalometric

Which of the following projections is best for the examination of the soft tissue profile of the face?

Lateral Cephalometric projection

Which technique is used for impacted 3rd molars, fractures of the mandible, ramus, & lesions of mandible?

Lateral Jaw Projection

Which of the following projections is best for the examination of a large lesion in the ramus?

Lateral Jaw projection

Which of the following projections is best for the examination of fractures of the mandibular body?

Lateral Jaw projection

Which of these radiographs is most frequent prescribed by the orthodontist?

Lateral cephalometric

Which technique is used to view the orbit & frontal sinuses?

Posteroanterior Skull projection

Which technique is used to evaluate fractures of the condylar neck & ramus area?

Reverse town projection

Which of the following projections is bet for examination of fractures of the condylar neck?

Reverse towne projection

Rare earth intensifying screens require less radiation to produce a quality image. Rare earth intensifying screens emit a blue light when energized by x-rays.

The first statement if true, the second is false

Which technique aids in diagnosing ankylosis a stiffening of the TMJ, malignancies, fractures, and tissue damages caused by arthritis?

Transcranial Projection & TMJ Tomography

Which of the following projections is best for the examination of the condyle and articular eminence?

Transcranial projection

A disadvantage of use of cone-beam data is that many dental professionals who incorporate CBCT into their practices have not had the training required to interpret anatomy beyond the maxilla and mandible.

True

A short exposure time decreases the chances for motion artifacts to occur, as well as encouraging a high level of patient cooperation.

True

If the field of view is small, findings or pathology in other regions of the oral and maxillofacial complex may be missed.

True

Three-dimensional imaging provides an in-depth image that gives dental professionals a more complete interpretive image than with two-dimensional scans of traditional radiography.

True

Three-dimensional imaging serves a number of diagnostic purposes for dental practitioners.

True

Which of these radiographs would best image the maxillary sinus?

Waters

Which of the following projections is best for the examination of the maxillary sinus?

Waters projection

Which technique is used to evaluate the max, frontal & ethmoid sinuses?

Waters projection

Term used to describe computer-assisted digital imaging in dentistry; this imaging technique uses a cone-shaped x-ray beam to acquire information and present it in three dimensions

cone-beam computer tomography

The number of gray scale colors available to be chosen for each pixel in the image.

contrast resolution

A vertical plane that divides the body into anterior and posterior sides; runs perpendicular to the ground.

coronal plane

The area that can be captured when performing imaging procedures.

field of view

An area of high attenuation that could stop radiation from reaching the receptor could include which of the following?

metal crown bridge large amalgam restoration

The reconstruction of raw data into images when imported into viewing software to create three anatomical planes of the body.

multiplanar reconstruction (MPR)

Intensifying screens will

reduce exposure time

A vertical plane that divides the body into right and left sides; runs perpendicular to the ground.

sagittal plane

A three-dimensional shape that is created from two-dimensional images

three-dimensional volume rendering

Which of the following is true regarding tomography when compared to extraoral radiography?

utilizes a moving x-ray source and moving image receptor

The smallest element of a three-dimensional image.

voxel