MDS PREP
Intensifying screen is used in extraoral radiograph to
1. Decrease patient radiation
2. Increase contrast
3. Decrease contrast
4. Collimation
Radiology
Answer: 1
Intensifying screen is used in extraoral radiographs to decrease patient radiation.
Overexposure of film results in
1. Increased density and dark film
2. Increased density and light film
3. Decreased density and light film
4. Decreased density and dark film
Radiology
Answer: 1
Overexposure of film results in increased density and dark film.
Base of skull can be viewed by
1. Towne"s projection
2. Submentovertex
3. PA view of skull
4. Both A and B
Radiology
Answer: 4
The base of the skull can be viewed by both Towne's projection and Submentovertex.
The best radiographic view for TMJ is
1. Lateral oblique
2. PA view
3. Waters view
4. OPG
Radiology
Answer: 4
The best radiographic view for TMJ is OPG.
The anatomical structure of mandible commonly seen in periapical films of maxillary third molar region is
1) Coronoid process
2) Condylar process
3) Ramus mandible
4) Body of mandible
Radiology
Answer: 1
The coronoid process of the mandible may project into the maxillary third molar region on periapical radiographs when the patient opens their mouth wide. Other structures, like the condylar process or ramus, are less likely to overlap in this region.
The wavelength of X-ray photon depends upon
1) Milli amperage
2) Kilo voltage
3) Distance between source and object
4) Quantity of electrons in the cathod stream
Radiology
Answer: 2
The wavelength of X-ray photon depends upon kilo voltage.
The wavelength of X-rays is inversely proportional to their energy, and the
energy of X-ray photons is determined by the kilo voltage (kV) used in the X-ray
tube. Higher kV results in higher energy and shorter wavelength photons, which
are more penetrating and are used for imaging denser tissues, while lower kV
results in lower energy and longer wavelength photons, which are less
penetrating and are used for imaging softer tissues. The other factors mentioned
(milli amperage, distance between source and object, and quantity of electrons
in the cathodic stream) affect the intensity of the X-ray beam but not the
wavelength of the photons.
The view in which patient"s chin placed touching radiographic cassette
1. PA view of skull
2. Towne"s view
3. Submentovertex
4. Waters view
Radiology
Answer: 4
The view in which the patient's chin is placed touching the radiographic cassette is Waters view.
An intraoral periapical X-ray is taken for evaluation of impacted third molar. Another X-ray is taken with downward angulation to first one. If third molar is lingual impaction it will appear to
1. Move downward in relation to inferior alveolar canal
2. Move upward in relation to inferior alveolar canal
3. Be stable in relation to inferior alveolar canal
4. None of the above
Radiology
Answer: 1
If a third molar is lingually impacted, it will appear to move downward in relation to the inferior alveolar canal when taking a second X-ray with downward angulation.