Misc from Quizzes Flashcards
(19 cards)
What is important to the image quality of an x-ray?
density, sharpness, distortion, exposure time
What is the most radio lumescent?
air (allows the x-ray beam to pass through them since it is not dense)
Computed tomography is x-rays that are compiled by a ______
into cross sectional images of the body that are relatively free from _______ of the different tissues.
computer, suprimposition
CT slices are not axial but _____.
helical
Projections from the CT provide sufficient data to calculate the radiodensities for each cubic _______ or less within each slice
millimeter
CT myelography is best to use for what purpose?
injection of contrast may identify postoperative Spinal stenosis
The cone beam of a CT scan is best used for what?
shorter scanning time for things like wrist and hand
The produce of the pixel and slice thickness is called a
voxel
A single voxel may contain different tissues.
When multiple tissues are in a single voxel, the computer performs _____ averaging can result in loss of _____ resolution.
volume, contrast
Ideal viewing position for an axial CT
viewed as if the patient is in supine looking caudocephalad (upwards)
-Back (Posterior) of the section is at the Bottom of the image
Ideal viewing position for an sagittal CT
viewed from L to R
Ideal viewing position for a coronal CT
front to back as if the patient is facing the clinician
Things that degrade a CT
movement, too thick a slice, and metals
Pathologies ideal for a CT scan
loose bodies in a joint, complex fractures, trauma/multiple injuries, degenerative changes (such as spinal stenosis)
forms of radiography (x-ray) using the same mechanism of ionizing radiation
CT and fluroscopy
Imaging with nuclear medicine additives
MRI, CT, and bone scintography
Imaging for avascular necrosis
bone scintography
Imaging for infection
nuclear med/contrast study
Imaging for disc herniation + injection
fluroscopy
