Chapter 26 radiology

scan time varies between:

7-30 seconds

Term used to describe computer-assisted digital imaging in dentistry; this imaging techinique uses a cone-shaped x-ray bean to acquire information and present it in three dimensions. requires formal training to interpret data on anatomical areas beyond the maxilla and the mandible. interpreted only by a board-certified oral and maxillofacial radiologist, or by a dentist with adequate training and/or experience.

Cone-beam computed tomography (CBCT)

term used to describe computer-assisted digital imaging in dentistry; used interchangeably with "cone-beam volume imaging" (CBVI)

Cone-beam volume tomography (CBVT)

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

Contrast resolution

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

DICOM data

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

True

common uses of three-dimensional ima maging include the following:

•Implant placement •Extraction or exposure of impacted teeth •Definition of anatomic structures, such as inferior alveola nerve and mental foramen location •Endodontic assessment •Airway and sinus analysis •Evaluation of temporomandibular joint (TM]) disorders •ortho evaluation •evaluation of lesions and abnormalities •trauma evaluation

Cone - beam data has a 2 : 1 relationship with the anatomy

False

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

sagittal plane (Z)

A measurement of pixel size in multiplanar reconstruction.

spatial resolution

Which is/are advantage(s) of CBCT imaging? a. images can be saved digitally in a .jpg or .bmp format b. images can be placed on a compact disc c. images can be emailed to referring dentists d. all of the above

All of the above

horizontal plane that divides the anatomical features within the FOV (field of view) into superior and inferior slices

Axial place (X)

what equipment is needed for three-dimensional digital imaging

CBCT machine, computer, viewing software

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

Coronal plane (Y)

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

False

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

Three-demonsional colume rendering

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 imaging.

True

The fact that the cone-beam data has a 1:1 relationship with the anatomy means that: a. anatomically accurate images are produced b. magnification of measurements does not occur c. CBCT eliminates the superimposition of structures d. all of the above

a. anatomically accurate images are produced

radiation from An area of high attenuation that could stop reaching the receptor could include which restoration(s)? a. metal crown b. bridge c. large amalgam restoration d. all of the above

all of the above

The area that can be captured when performing imaging procedures.

field of view

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

multiplanar reconstruction (MPR)

The smallest element of a three-dimensional image.

voxel

Advantages of three-dimensional digital imaging

• lower radiation dose • brief scanning time • anatomically accurate images • ability to save and easily transport images

Disadvantages of three-dimensional digital imaging

• patient movement and artifacts •Size of field of view • cost of equipment; training needed for imaging software • lack of training in interpretation of image data on areas outside the maxilla and the mandible