NEET MDS Shorts
14501
RadiologyWhen evaluating intraoral periapical films, lingual structures have improved sharpness.
18958
RadiologyMultiple radiolucencies are common in all of the following except osteopetrosis.
66230
RadiologyRadiographic evidence of cortical bone loss typically becomes apparent when at least 13% of the bone height has been lost. This is because the density of the bone and the surrounding structures needs to be significantly altered to be detectable on an X-ray film.
50450
RadiologyIn reverse Townes projection, the central X-ray passes through the occipital bone.
36805
RadiologyThe best X-ray for mesiodens is occlusal.
26051
RadiologyThe extraoral radiograph that best demonstrates the subcondylar portion of the mandible is Towne's view.
72066
RadiologyThe base of the skull can be viewed by both Towne's projection and Submentovertex.
49807
RadiologyQuality of the x-ray beam is dependent on the temperature of the cathode filament.
76595
Radiology
Tomography is a diagnostic imaging method that is often referred to as basic
"sectional" or "slice" radiography. It involves taking a series of
two-dimensional images of a specific area or "slice" of the body, using a narrow
beam of radiation that passes through the body from multiple angles. These
images are then combined to create a detailed, cross-sectional view of the
internal structures, allowing for the visualization of the body without the
superimposition of structures outside the area of interest. This technique is
particularly useful for diagnosing conditions that may not be apparent on
standard X-rays.
Explanation of the other options:
1) Othopantomography: This is a type of panoramic radiography used to capture a
wide-angle view of the teeth, jaw, and other oral structures. While it does
produce an image of a "section" of the body, it is not typically referred to as
"sectional" or "slice" radiography in the same sense as tomography, as it does
not involve the same layering or cross-sectional approach.
2) Cephalogram: A cephalogram is a specific type of X-ray used in dentistry and
orthodontics to examine the soft tissues and bones of the face and head,
particularly the skull and jaw. It provides a two-dimensional, flat
representation of the head from the side view, and while it is a form of
radiography, it does not produce the layered or cross-sectional images that are
characteristic of tomography.
53911
Radiology
Hyperparathyroidism is a condition characterized by an
overproduction of parathyroid hormone (PTH), which leads to increased bone
resorption and changes in bone density. The radiographic features associated
with hyperparathyroidism include: Loss of Lamina Dura: The lamina dura is the thin layer
of dense bone that lines the tooth socket (alveolus). In
hyperparathyroidism, the loss of lamina dura can be observed due to the
increased osteoclastic activity and bone resorption. Ground Glass Appearance: This refers to a radiographic
appearance of bone that looks hazy or "ground glass" rather than having a
clear, well-defined structure. This appearance is due to the alteration in
bone density and the presence of fibrous tissue replacing normal bone. Osteogenesis Imperfecta: This condition is characterized
by brittle bones due to a defect in collagen formation. Radiographically, it
may show thin cortices and osteopenia, but not typically a ground glass
appearance. Osteopetrosis: This is a condition of excessive bone
density due to impaired osteoclast function. Radiographically, it shows
increased radiopacity (dense bones) rather than a ground glass appearance. Osteitis Deformans (Paget's Disease): This condition is
characterized by disorganized bone remodeling. Radiographically, it can show
a "cotton wool" appearance and enlarged bones, but it does not typically
present with a loss of lamina dura or a ground glass appearance in the early
stages.
Other Options: