Quiz 7: Introduction to Radiographic Assessment

Sequence the imaging modalities from lowest to highest radiation dose: Intraoral radiography Panoramic radiography CT (computed tomography) CBCT (cone beam computed tomography) Conventional tomography

1. Intraoral radiography 2. Panoramic radiography 3. Conventional tomography 4. CBCT (cone beam computed tomography) 5. CT (computed tomography)

CBCT

The radiographic image you see is taken with which of the following techniques? Select the correct answer. Panoramic imaging Intraoral radiography CBCT Lateral cephalometric imaging Plane film tomography

CT

This radiographic image was taken using which of the following techniques? Select the correct answer. Panoramic imaging Intraoral radiography CBCT CT Lateral profile radiography

T/F: A fundamental principle of diagnostic imaging is ALARA, or doses that are As Low As Reasonably Achievable.

True

T/F: CBCT and CT both suffer from acquisition artifacts such as cupping, beam hardening, and scatter in the presence of radiopaque restorations and implants.

True

T/F: Diagnostic radiographs seek to assess areas for the presence of pathology and the boundaries of any such conditions that are discovered.

True

T/F: Panoramic radiography may seem easy to perform, but it is a technique where many mistakes are made.

True

T/F: The ALADA principle states that doses should be As Low As Diagnostically Acceptable without compromising image quality.

True

Radiation dosage of CBCT are equivalent to:

a week or more of additional background radiation

Evaluation of a new dental implant patient is initially performed with a clinical examination and: Select the correct answer. 3D radiographic imaging no additional radiographs radiographs including 2D and 3D imaging radiographs during surgery appropriate conventional radiographs

appropriate conventional radiographs

Implementing ALARA (As Low As Reasonably Achievable) into practice involves consideration of: Select all correct answers appropriate equipment selection maintenance of equipment use of appropriate shielding in walls individualized selection of x-ray exposures exposure monitoring

appropriate equipment selection maintenance of equipment individualized selection of x-ray exposures

In implant dentistry, cephalometric imaging is most useful for providing an: Select all correct answers assessment of the exact amount of horizontal bone in the posterior areas assessment of the relationship between the upper and lower jaws estimate of the angulation of the anterior jaws estimate of the widths of the jawbones in their mid-sagittal regions estimate of the extent of the maxillary sinus

assessment of the relationship between the upper and lower jaws estimate of the angulation of the anterior jaws estimate of the widths of the jawbones in their mid-sagittal regions

Several strategies can be used to reduce the radiation dose. These include: Select all correct answers use of CBCT scans only avoiding unnecessary exposure of radiosensitive organs and tissues outside the area of interest use of appropriate shielding in walls use of individualized exposure protocols exposure monitoring

avoiding unnecessary exposure of radiosensitive organs and tissues outside the area of interest use of appropriate shielding in walls use of individualized exposure protocols exposure monitoring

Routine replacement of current radiographic techniques must be considered with great care, especially when treating: Select the correct answer. adults elderly patients children patients with chronic diseases male patients

children

For radiographic 3D imaging, tomographic techniques can be used. The three different tomographic modalities used in implant dentistry are: Select all correct answers cone beam computed tomography (or CBCT) conventional tomography conventional panoramic computed tomography (or CT) conventional lateral profile radiography

cone beam computed tomography (or CBCT) conventional tomograpyhy computed tomography (or CT)

What is a beam hardening artifact?

dark bands between two dense objects

Radiation dosage of intraoral radiographs are equivalent to:

days of additional background radiation

What is a cupping artifact?

distortion of metallic objects

There is a range of radiation doses for each imaging modality, and sometimes these ranges are: Select the correct answer. highly variable difficult to measure non-existent not important for daily clinical practice not known

highly variable

Radiation risk is controlled by: Select all correct answers optimization of patient positioning justification of the investigation using the right magnification optimization of the image acquisition process dose limitation

justification of the investigation optimization of the image acquisition process dose limitation

For post-treatment monitoring, 3D imaging is: Select the correct answer. normally not needed indispensable dependent on the time of delivering the suprastructure inevitable when potential peri-implant defects should be evaluated of benefit as the artifacts associated with the radiopaque implant are of minor importance

normally not needed

Radiation dosage of CT are equivalent to:

several weeks of additional background radiation

The preferred initial investigation in implant dentistry is 2D imaging because it is: Select all correct answers less expensive suitable for diagnosis suitable for treatment planning suitable for guided surgery suitable for post-treatment monitoring

suitable for diagnosis suitable for treatment planning suitable for post-treatment monitoring

Staff and other patients in the office must be protected by: Select all correct answers use of intraoral radiography only referring patients to a radiographic specialist setting use of appropriate shielding in walls use of panoramic radiography only exposure monitoring

use of appropriate shielding in walls exposure monitoring

Unnecessary exposure of radiosensitive organs and tissues must be avoided by: Select the correct answer. use of intraoral radiography only use of appropriate shielding in walls use of panoramic radiography only use of appropriate shielding of the organ in question exposure monitoring

use of appropriate shielding of the organ in question

Both CT and CBCT collect radiographic data in volume elements, or ____, that record the radiopacity of a small volume of space in the field of view. Select the correct answer. voxels bits pixels dots pictels

voxels

What is a scattering artifact?

white streaks

For which of the following indications is 3D radiographic imaging often indicated? Select the correct answer. Postoperative radiographic control Evaluation prior to sinus floor elevation Follow-up examinations Intraoperative radiographic control Evaluation of peri-implantitis

Evaluation prior to sinus floor elevation

T/F: CT is somewhat more prone to beam hardening and scatter artifacts than CBCT

False

T/F: CT is somewhat more prone to beam hardening and scatter artifacts than CBCT.

False

T/F: Panoramic radiographs are good for overall assessment as well as dimensionally accurate for implant selection.

False

T/F: Patient risk from radiation is considered to be tissue related.

False

T/F: Periapical radiography is a fundamental technique with sufficient accuracy to estimate ridge width.

False

When cross-sectional imaging is indicated for dental implant treatment planning: Select the correct answer. CBCT (cone beam computed tomography) is preferable to CT (computed tomography) intraoral radiographs are preferable to panoramic views MRI (magnetic resonance imaging) is preferable to CT conventional tomography is preferable to CBCT lateral profile radiograph is preferable to CBCT

CBCT (cone beam computed tomography) is preferable to CT (computed tomography)

CBCT is less capable than ____ for imaging soft tissues. Select the correct answer. lateral cephalometric radiographs CT panoramic radiographs intraoral radiographs lateral profile radiographs

CT

CBCT imaging often involves lower radiation doses than conventional: Select the correct answer. CT scans panoramic radiographs intraoral radiographs using the half angle technique intraoral radiographs using the long-cone paralleling technique lateral profile radiography

CT scans