Question 1

The energy source for CT scans is:

Accepted Answer

CT (Computed Tomography) scans use x-radiation as the energy source. The x-rays are absorbed differently by different tissues in the body, which allows imaging of internal structures.

Question 2

What is the average absorbed dose from a CBCT scanner?

Accepted Answer

The average absorbed dose from a CBCT scanner is 12.0 mSv (millisieverts).

Question 3

All of the following describe wavelengths used in MRI EXCEPT one.Which one is the EXCEPTION?

Accepted Answer

Gamma radiation is not used in MRI. MRI uses radio waves which have long wavelengths and do not cause ionization or produce a radiation dose to the patient.

Question 4

Computed Tomography eliminates the superimposition of images of structures superficial or deep to the area in question,but has an increased radiation dose when compared with conventional film.

Accepted Answer

Both statements are true. Computed Tomography (CT) provides cross-sectional images, eliminating the superimposition seen in conventional radiography, but it does involve a higher radiation dose.

Question 5

The cost to the patient for a CT scan is more expensive compared to a panoramic radiograph.

Accepted Answer

CT scans are generally more expensive than panoramic radiographs due to their complexity and the need for specialized equipment and trained technicians.

Question 6

CT images can be transmitted to specialists for consultation.

Accepted Answer

CT images can be easily transferred to other medical professionals for evaluation and consultation using electronic communication systems such as PACS (picture archiving and communication system).

Question 7

Identify which technique uses organ-specific compounds that are injected into the patient,and are detected and imaged by a sensor called a gamma camera.

Accepted Answer

This technique is called Nuclear medicine, where organ-specific compounds called radiopharmaceuticals are injected into the patient and then detected by a gamma camera to produce images of the organ's function and metabolism. MRI, CBVT, and CT Scans do not use radiopharmaceuticals and employ different techniques to produce images of the body.

Question 8

MRI actually measures:

Accepted Answer

MRI measures the density of hydrogen protons in the body, which is why it is also called proton density imaging.

Question 9

Radionuclide scanning is useful for examining all of the following EXCEPT one.Which one is the EXCEPTION?,bone and salivary gland tissue,as well as for investigating metabolic bone disorders,infection,and bone fractures.

Accepted Answer

Radionuclide scanning is not useful for examining periodontal disease.

Question 10

What does a CT number represent?

Accepted Answer

A CT number, also known as Hounsfield unit (HU), represents the density of a particular area that has been penetrated by the x-ray beam. It is a quantitative measurement of the degree of X-ray attenuation by the tissue, with water as the reference point for zero HU and air as -1000 HU. The CT scanner measures the X-ray attenuation and converts it into a numerical value that corresponds to the HU or CT number.

Question 11

Cone beam computed tomography generate significantly less radiation than do traditional medical CT scanning devices,but deliver poorer diagnostic images.

Accepted Answer

Cone beam computed tomography does generate significantly less radiation than traditional medical CT scanning devices. However, compared to traditional CT scanning devices, cone beam computed tomography delivers lower quality images, which may result in poorer diagnostic outcomes.

Question 12

Water makes up approximately:

Accepted Answer

Water makes up approximately 70% of human tissue. It is necessary for various physiological processes in the body such as digestion, absorption, transportation, and temperature regulation.

Question 13

The same sources of energy are used for CT scanning than for MRI.

Accepted Answer

CT scanning uses X-rays for imaging, while MRI uses a strong magnetic field and radio waves. These are two different sources of energy.

Question 14

CBVT (CBCT)imaging may be utilized in dentistry for all of the following conditions EXCEPT:

Accepted Answer

CBVT (CBCT) imaging is not commonly used for evaluating interproximal caries as it is not as accurate as traditional bitewing radiographs. It is, however, useful for evaluating other conditions such as oral pathologies, implant treatment planning, and the evaluation of impacted teeth.

Question 15

The patient's maxillofacial area that is of interest when taking a CBCT image is known as the field of view (FOV).

Accepted Answer

The CBCT image is a specialized radiograph used for imaging the maxillofacial area of the patient. The area of interest is known as the field of view (FOV). Therefore, the correct answer is C-Field of view (FOV).

Question 16

A CT scan taken in the axial plane can be reformatted to the sagittal and frontal planes.

Accepted Answer

The answer of A CT scan taken in the axial...

Question 17

CT images for implant planning should have cross-sectional views.

Accepted Answer

Cross-sectional views are necessary for accurately planning implant placement and assessing bone density and anatomy.

Question 18

Identify the reason that the technician takes a scout film when taking images with CBCT?

Accepted Answer

A scout film in CBCT imaging is primarily taken to ensure that the patient is correctly positioned before proceeding with the actual imaging process. This step is crucial for acquiring accurate and diagnostic-quality images.

Quiz 16: Advanced Imaging Systems