Radiology: Chapter 27- Three-Dimensional Digital Imaging

DICOM

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

voxel

the smallest element of a three-dimensional image

spatial resolution

a measurement of pixel size in multiplanar reconstruction

sagittal plane

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

multiplanar reconstruction (MPR)

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

field of view

the area that can be captured when performing imaging procedures

cone-beam computed tomography

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

coronal plane

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

contrast resolution

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

three-dimensional volume rendering

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

Compared with traditional computed tomography (CT) procedures, cone-beam imaging provided a high radiation dose for the patient. True or false?

False

A short exposure time decreases the chances for motion artifacts to occur and encourages a high level of patient cooperation. True or false?

True

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

True

Cone-beam data has a 2:1 relationship with the anatomy. True or false?

False

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

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 or false?

True

Three-dimensional imaging serves a number of diagnostic purposes for dental practitioners. True or false?

True

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

a. metal crown

b. bridge

c. large amalgam restoration

d. all of the above

d. all of the above

Which is/are advantages of CBCT imaging?

a. images can be saved digitally in a .jpg or .bmp format

b. images can be placed on compact disc

c. images can be emailed to referring dentist

d. all of the above

d. all of the above

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