medical imaging Flashcards
In x-ray some radiation is absorbed and some are scattered absorption is called
Attenuation
Description of x-rays
Type film
adequacy
which way round
Sagittal
Splits the in half, think of Sagittarius with his bow and arrow
Coronal
But in a crown on and splitting the body into anterior and posterior planes
Issues of x-rays
Radiation
only 2D
soft tissue doesn’t attenuate well
Advantages of x-rays
Cheap
easy
good to see bone
fast
Computer tomography
X-rays in 3D images
Units for attenuation
Houndsfield units
Issue with CT
High-dose radiation
a poor detail of soft tissue
Positron emission tomography
Radiolabelled glucose
shows area of high metabolic activity
use along side CT scanning to give a 3D imaging area
Give two examples of where it can use pet scan
Cancers
brain images and epilepsy
dementia
Disadvantages of pet scan
Expensive
radiation
needs to be done by special radiologist
Two types of MRI T1 and T2
T1- black
T2 white
relate to colour water goes
Advantages of MRI
Most detail
doesn’t use radiation
show soft tissue
Disadvantages of MRI
Expensive
claustrophobic
noisy
slow test
not great for bones better the soft tissue
cannot be used in some patients of metal implants
