Deck 26: Three-Dimensional Digital Imaging

Question 1

Prior to CBCT, patient preparations include:

A) Removal of metallic items in the head and neck region.
B) Removal of eyeglasses.
C) Specific directions as to performing the scan while teeth are slightly apart or biting together.
D) All of the above.

Answer 1

All of the above.

Question 2

One of the advantages of using DICOM Data is that images among dental professionals, imaging centers, and physicians may be shared. The volume of data produced is similar to medical computed tomography but CBCT uses more radiation to acquire the images.

A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second statement is false.
D) The first statement is false; the second statement is true.

Answer 2

The first statement is true; the second statement is false.

Question 3

Viewing software allows the practitioner to select the region of interest and to scroll through these images on a computer monitor to create three-dimensional information that will assist in ____.

A) Obtaining insurance reimbursement.
B) Referrals.
C) Diagnosis and treatment planning.
D) All of the above.

Answer 3

Diagnosis and treatment planning.

Question 4

Common uses of three-dimensional imaging include which of the following?
1) Implant placement
2) Extraction or exposure of impacted teeth
3) Definition of anatomic structures
4) Airway and sinus analysis
5) Evaluation of temporomandibular joint disorders

A)1, 2, 3, 4, 5
B)2, 4, 5
C)1, 2, 3
D)Some other combination

Question 5

Cone beam computer tomography utilizes a vertical, narrow x-ray beam, similar to panoramic radiography, to acquire three-dimensional information. The source of radiation in the CBCT machines rotates around the head of the patient.

A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second statement is false.
D) The first statement is false; the second statement is true.

Question 6

Failure of the dental practitioner to evaluate, interpret, and document observations outside the region of dental interest could result in negative consequences for the patient. It is not the responsibility of the dental practitioner to recognize findings and pathology outside the region of dental interest.

A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second statement is false.
D) The first statement is false; the second statement is true.

Question 7

In the past, three-dimensional imaging was performed primarily with ____. Today, manufacturers of cone beam computer tomography have developed three-dimensional imaging specifically to evaluate the ____.

A) Dental procedures; whole body
B) Medical procedures; oral and maxillofacial complex
C) Other imaging techniques; site-specific area
D) Multiplanar reconstruction; head and neck area

Question 8

The specialized equipment necessary for three-dimensional imaging that accepts the raw data and converts it to a stack of axial images called DICOM images is called the

A) Computer.
B) Control panel.
C) Imaging hardware.
D) CBCT machine.

Question 9

When viewed together, the axial, coronal, and sagittal images are referred to as:

A) MPR images.
B) Multiplanar reconstructed images.
C) CBCT images.
D) Both a and b.

Question 10

With CBCT, the divergent rays exit the machine and some of the radiation is attenuated by the patient. In this statement, attenuated means :

A) To dilute.
B) To make thin or weak.
C) To reduce the strength of.
D) All of the above.

Question 11

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

A) Multiplanar reconstruction.
B) Axial plane.
C) Coronal plane.
D) Sagittal plane.

Question 12

The universal format for handling, storing, and transmitting three-dimensional images is called:

A) Cone-beam Computer Tomography.
B) Digital Imaging and Communications in Medicine.
C) Voxel.
D) Spatial Resolution.

Question 13

Studies have compared the radiation dose of a typical CBCT scan to the radiation dose received from ____.

A) Three or four panoramic images.
B) Three or four full-mouth series of intraoral images.
C) A traditional CT procedure.
D) Bitewing images.

Question 14

Factors that can be altered when scanning the patient include:

A) Contrast resolution.
B) Spatial resolution.
C) Size of field of view.
D) All of the above.

Question 15

A short exposure time for the CBCT, ____ the chances for motion artifacts to occur, as well as ____ patient cooperation.

A) Does not affect; encourages
B) Increases; decreases
C) Decreases; increases
D) None of the above

Question 16

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

A) Two-dimensional volume rendering
B) Three-dimensional volume rendering
C) Spatial resolution
D) Contrast resolution

Question 17

The purpose of three-dimensional imaging includes which of the following?

A) Eliminates deficiencies that could hinder accurate interpretation of images.
B) Used to enhance the evaluation of pathology.
C) Used to determine distances to critical anatomic landmarks.
D) All of the above.

Question 18

The acronym, DICOM, stands for:

A) Digital Imaging and Communication in Medicine
B) Direct Imaging and Cone-beam Modality
C) Distance Imaging and Communications in Medicine
D) Divergent Images and Cone-beam Modus

Question 19

The information that the receptor receives is termed the:

A) Computer analysis.
B) Image.
C) Raw data.
D) DICOM data.

Question 20

Cone-beam data is said to have a 1:1 relationship with the anatomy. This means that:

A) Anatomically accurate images are produced.
B) CBCT eliminates the superimposition of structures.
C) Magnification of measurements does not occur.
D) All of the above.

Question 21

According to the American Academy of Oral and Maxillofacial Radiology, who may perform CBCT and implant imaging?

A) A dental hygienist
B) A general dentist with adequate training or experience
C) A board-certified oral and maxillofacial radiologist
D) b and c

Question 22

Radiation is stopped and may not reach the receptor when it interacts with an area of high attenuation, such as:

A) Soft tissue.
B) Large amalgam restorations.
C) Periodontal abscess.
D) Normal anatomic structures.

Question 23

If the field of view is large, findings or pathology in other regions of the oral and maxillofacial complex may be accidently included. The size of the field of view should not matter if a high-quality machine is used.

A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second statement is false.
D) The first statement is false; the second statement is true.

Question 24

The specialty of oral and maxillofacial radiology was recognized in 1999 by the:

A) Public.
B) American Radiology Association.
C) American Dental Association.
D) Academy of Oral and Maxillofacial Surgery.

Question 25

Metallic restorations may eliminate or hide the surrounding anatomy with the appearance of:

A) High density.
B) Fogged film.
C) Streak artifacts.
D) Blank images.

Question 26

Many dental professionals who incorporate CBCT into their practices have not had the training required to interpret anatomy beyond the maxilla and mandible. What steps can be taken to correct this deficiency that could potentially hinder the use of CBCT?

A) Incorporate CBCT into educational curricula.
B) Hire a trained interpreter to read CBCTs in the dental office.
C) Offer continuing education courses to dental professionals.
D) Both a and c
E) All of the above