Question 1

(1)There are CBCT machines that have shortened exposure times of 8-10 seconds.(2)This shortened exposure time results in increased patient cooperation and decreased artifacts caused from patient movement.

Accepted Answer

With some machines,cone-beam data can be acquired with a quick 8- to 10-second scan.This short exposure time decreases the chance for motion artifacts to occur and encourages a high level of patient cooperation.

Question 2

(1)In preparation for a CBCT scan,you should explain to your patient how she will be positioned and the length of time she will need to be motionless.(2)Your patient will be able to leave her jewelry on but will need to remove her partial denture.

Accepted Answer

In preparation for a CBCT scan,you should explain to your patient how they will be positioned (sitting,standing,supine,and depending on the type of scan you may need to ask them to keep their upper and lower teeth separated)and the length of time they will need to be motionless.Prior to the CBCT procedure,instructions given to the patient include the removal of all metallic items in the head and neck region,including jewelry,eyeglasses,and removable dental appliances.

Question 3

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

Accepted Answer

The number of gray-scale colors available to be chosen for each pixel in the image is called contrast resolution.Three-dimensional volume rendering is a three-dimensional shape that is created from two-dimensional images.Spatial resolution is a measurement of pixel size in multiplanar reconstruction.

Question 4

(1)Contrast resolution and the size of the field of view can both be adjusted on CBCT machines.(2)Spatial resolution cannot be adjusted.

Accepted Answer

Factors that can be altered when scanning the patient include the size of the field of view and the resolution (contrast and spatial).

Question 5

The image produced on the receptor following exposure to the x-ray beam is

Accepted Answer

The information that the receptor receives is termed the raw data.This raw data,which is three-dimensional in volume,undergoes reconstruction forming a stack of axial images termed DICOM images.

Question 6

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

Accepted Answer

Three-dimensional digital imaging is an image that demonstrates the anatomy in three dimensions.When viewed together,the axial,coronal,and sagittal images are referred to as multiplanar reconstructed images or MPR images.Cone-beam computed tomography (CBCT)is 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 volume tomography (CBVT)is computer-assisted digital imaging in dentistry,used interchangeably with cone-beam volume imaging (CBVI).

Question 7

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

Accepted Answer

The specialized equipment necessary for three-dimensional imaging includes the CBCT machine,a computer,and various types of viewing software.The CBCT machine is comparable in size and appearance to a panoramic machine.In a single rotation,the source of radiation and the receptor capture the field of view by use of a solid-state flat panel detector.This raw data is sent to the computer.The computer is attached to the CBCT machine,and it accepts the raw data and converts it into a stack of axial images called DICOM images.

Question 8

(1)Three-dimensional imaging provides a more accurate image than traditional two-dimensional imaging.(2)Locations,distances,sizes,and shapes of pathology and anatomic landmarks,including eruption patterns,are more accurately represented with three-dimensional imaging.

Accepted Answer

These geometric characteristics limit the accurate interpretation of traditional two-dimensional images.The dental practitioner,therefore,may not have the ability to evaluate pathology (e.g. ,bony and soft tissue),distances to critical anatomic landmarks (e.g. ,maxillary sinus,mandibular canal),locations of impacted teeth,eruption patterns,or other concerns of the oral and maxillofacial complex.Three-dimensional imaging provides more detailed information allowing for a more accurate interpretation.

Question 9

(1)Cone-beam data is said to have a 1:2 relationship with the anatomy.(2)With CBCT imaging,anatomy can be accurately reproduced,the superimposition of structures is eliminated,and image magnification doesn't occur.

Accepted Answer

Cone-beam data is said to have a 1:1 relationship with the anatomy.Anatomically accurate images are produced.CBCT eliminates the superimposition of structures;magnification of measurements does not occur.

Question 10

(1)One of the advantages of using DICOM Data is that images among dental professionals,imaging centers,and physicians may be shared.(2)The volume of data produced is similar to medical computed tomography but CBCT uses more radiation to acquire the images.

Accepted Answer

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 much less radiation to acquire the images.

Question 11

The acronym,DICOM,stands for

Accepted Answer

The acronym DICOM stands for Digital Imaging and Communication in Medicine.

Question 12

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 ____________.
1)obtaining insurance reimbursement
2)referrals
3)diagnosis and treatment planning

Accepted Answer

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 diagnosis and treatment planning.

Question 13

(1)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.(2)It is not the responsibility of the dental practitioner to recognize findings and pathology outside the region of dental interest.

Accepted Answer

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 the responsibility of the dental practitioner to recognize findings and pathology outside the region of dental interest.

Question 14

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

Accepted Answer

Attenuate means to dilute.With CBCT,the divergent rays exit the machine and some of the radiation is attenuated by the patient.In this statement,attenuated means to dilute,to make thin or weak,or to reduce the strength of the divergent rays as they pass through the body.Some of the radiation passes through the patient and is received by a digital receptor;to amplify is the opposite of attenuate;to increase is the opposite of attenuate;to intensify is the opposite of attenuate.

Question 15

Your patient is concerned about the amount of radiation she is receiving from the dental x-rays she has been receiving.You will be taking a CBCT scan.Based on evidence-based research,you can share with your patient that the CBCT scan is equal to which of the following?

Accepted Answer

Compared with traditional CT procedures,cone-beam imaging provides a lower radiation dose for the patient.Studies have compared the radiation dose of a typical CBCT scan to the radiation dose received from three or four full-mouth series of intraoral images.

Question 16

(1)Cone-beam computed tomography utilizes a vertical,narrow x-ray beam,similar to panoramic imaging,to acquire three-dimensional information.(2)The source of radiation in the CBCT machines rotates around the head of the patient.

Accepted Answer

Cone-beam computed tomography utilizes a cone-shaped x-ray beam to acquire three-dimensional information.The source of radiation in the CBCT machines rotates around the head of the patient.

Question 17

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

Accepted Answer

The reconstruction of raw data into images when imported into viewing software to create three anatomic planes of the body is called multiplanar reconstruction.Axial plane is a horizontal plane that divides the body into superior and inferior parts.Coronal plane is a vertical plane that divides the body into anterior and posterior sides.Sagittal plane is a vertical plane that divides the body into right and left sides.

Question 18

(1)Until recently,three-dimensional imaging has been used primarily for medical image purposes.(2)Cone-beam computed tomography was developed for use in dentistry to evaluate the oral and maxillofacial areas of the head and neck.

Accepted Answer

In the past,three-dimensional imaging was performed primarily with medical procedures.Today,manufacturers of cone-beam computed tomography have developed three-dimensional imaging specifically to evaluate the oral and maxillofacial complex.

Question 19

Three-dimensional imaging is encoded for handling,storage,and transmission by which of the following?

Accepted Answer

Cone-beam computed tomography (CBCT)is the term used to describe computer-assisted digital imaging in dentistry.The universal format for handling,storing,and transmitting three-dimensional images is called Digital Imaging and Communications in Medicine.Voxel refers to the smallest element of a three-dimensional image.Spatial resolution is a measurement of pixel size in multiplanar reconstruction.

Question 20

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

Accepted Answer

Some common uses of three-dimensional imaging include implant placement,extraction or exposure of impacted teeth,definition of anatomic structures,endodontic assessment,airway and sinus analysis,evaluation of temporomandibular joint disorders,orthodontic evaluation,and pathology concerns.

Quiz 26: Three-Dimensional Digital Imaging

(1) There are CBCT machines that have shortened exposure times of 8-10 seconds.(2) This shortened exposure time results in increased patient cooperation and decreased artifacts caused from patient movement.

(1) In preparation for a CBCT scan,you should explain to your patient how she will be positioned and the length of time she will need to be motionless.(2) Your patient will be able to leave her jewelry on but will need to remove her partial denture.

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

(1) Contrast resolution and the size of the field of view can both be adjusted on CBCT machines.(2) Spatial resolution cannot be adjusted.

The image produced on the receptor following exposure to the x-ray beam is

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

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

(1) Three-dimensional imaging provides a more accurate image than traditional two-dimensional imaging.(2) Locations,distances,sizes,and shapes of pathology and anatomic landmarks,including eruption patterns,are more accurately represented with three-dimensional imaging.

(1) Cone-beam data is said to have a 1:2 relationship with the anatomy.(2) With CBCT imaging,anatomy can be accurately reproduced,the superimposition of structures is eliminated,and image magnification doesn't occur.

(1) One of the advantages of using DICOM Data is that images among dental professionals,imaging centers,and physicians may be shared.(2) The volume of data produced is similar to medical computed tomography but CBCT uses more radiation to acquire the images.

The acronym,DICOM,stands for

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 ____________. 1) obtaining insurance reimbursement 2) referrals 3) diagnosis and treatment planning

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

Your patient is concerned about the amount of radiation she is receiving from the dental x-rays she has been receiving.You will be taking a CBCT scan.Based on evidence-based research,you can share with your patient that the CBCT scan is equal to which of the following?

(1) Cone-beam computed tomography utilizes a vertical,narrow x-ray beam,similar to panoramic imaging,to acquire three-dimensional information.(2) The source of radiation in the CBCT machines rotates around the head of the patient.

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

(1) Until recently,three-dimensional imaging has been used primarily for medical image purposes.(2) Cone-beam computed tomography was developed for use in dentistry to evaluate the oral and maxillofacial areas of the head and neck.

Three-dimensional imaging is encoded for handling,storage,and transmission by which of the following?

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