imaging Flashcards
X-Ray
what is it
radiation used to crease white and black images
bone absorbs radiation = produces white images
air absorbs least radiation = produces black images
X-Ray
type of x-ray
Fluoroscope
is a continuous power beam of radiation, used for putting in pacemakers and hip replacements
X-Ray
Risks
Greater the dose = greater the risk
mutations to DNA
Cancer risks
Harm to fetus
X-Rays
risk
mutations of DNA
Cancer risk (low)
harm to fetus
MRI
what is it
high intensity magnetic field displaces the nuclei from their position, when they return the nuclei, energy is released, which is computerised and images are created
MRI
used for
brain, soft tissues, bone, tumors, tendon, ligs, muscle injuries, infections and blood vessels / strokes
MRI
Risk and negatives
Takes longer than CT scan - 60 mins
higher cost than MRI
Have to hold breath
MRI
Positives
No radiation risks
soft tissue more detailed than CT
CT scan
What is it
Uses x-rays and computer to create images
CT scan
Used for
trauma, injuries to bones, fractures, tumors/cancer, heart disease and injections
CT
Positives
No damager to metal implants - unless MRI that cant use anything with metal implant
bone images more clear that x-ray
cost less and quick than MRI 15 mins
CT
Risks
Increased radiation risk
Ultrasounds
What is it
High frequency sound waves fo soft tissues
Ultrasound
Used for
pleural effusion, liver, kidneys, gallbladder, pancrea, pregnancy, blood flow and joint inflammation
Ultrasound
positives
Lower cost than MRI
Portable
Widely available
No radiation risk
