Imaging Wk 1 Flashcards
Name the 4 types of radiology
- CT scan
- MRI
- X Ray
-Ultrasound
What is therapeutic radiography or radiotherapy
Involve radiography for the treatment and care of patients with cancer
What do doctors use Computed tomography for?
Broken bones
cancer
blood clots
signs of heart disease
internal bleeding
What is the CT scan the best for
bone
lungs
bleeding
any acute problem
soft tissues
organs
What does CT scan utilise…
X ray technology and sophisticated computers to create images of cross sectional ‘slices’ of the body
Advantages of CT scan
the x-ray on a CT scanner is more heavy-duty than tubes used for standard film imaging since the unit rotates
Modern CT scanners use solid state detectors that have very high efficiency low energy of x rays produced by CT scanners
Ultrafast ceramic detectors use rare earth elements such as silicon, germanium, yttrium which create a semiconducting p-n junction
Disadvantages of CT scan
opposite the patient has an array of detectors that measure the intensity of the x ray beam at points laterally across the patients body
solid state detectors are made of a variety of materials that create a semiconductor junction to a transmitter
ceramic solid detectors are very fast can be extremely stable and are produced to form an array of very small efficient detectors that can cover a large area
Describe the target ring
contains an array of detectors and is internally cooled, to reduce electronic noise and to cool the anode
What is an x ray
basic electromagnetic radiations which are used to create images inside the body
what do the different levels of black and white show
different level of absorption of x rays by different tissues
calcium in bones absorbs x rays the most, so bones look white
fat and other soft tissues absorb less and look gray
air absorbs the least so lungs look black
What is decubitus
patient lying down and the x ray beam horizontal
What are the description of techniques
position of patient
position of body part
position of cassette related to body part
direction and centre of x ray beam
breathing status
exposure factors
What is the x ray used for
lung
bone
heart (shape and size)
What is the most familiar use of x rays
checking broken bones
chest x rays can spot pneumonia
mammograms can be used to look for breast cancer
What is MRI
uses large magnetic and radio waves to look at organs and structures inside your body
