Medical Imaging Flashcards
What are 4 ionizing radiation imaging techniques?
- Plain Radiographs (x-rays)
- Computer Topography
- Fluoroscopy
- Nuclear Medicine
What are 2 non-radiation imaging techniques?
- Magnetic Resonance Imaging (MRI)
- Ultrasonography (ultrasound)
What are 2 non-radiation imaging techniques?
- Magnetic Resonance Imaging (MRI)
- Ultrasonography (ultrasound)
What is ionizing radiation?
Radiation that carried enough energy to free electrons from atoms or molecules, thereby ionizing them.
It is high energy radiation with potential adverse health effects.
- Found further up the electromagnetic spectrum than non-ionizing radiation
What is a Sievert?
a unit of effective equivalent dose in the human 1 J/Kg
- the mSv is the unit used to describe the dose received by a patient for an ionizing radiation used in medical imaging
What is a grey?
A unit of dose in the human - 1 Joule per Kg
How many mSv does the average UK resident receive per annum?
= 2.5 mSv
How many mSv is received after an intraoral x-ray?
= 0.005 mSv
(1 days worth of radiation)
How many mSv is received after a computed tomography CT - chest ?
= 7 mSv
(2 years of radiation)
How many mSv is received after radiography - chest ?
= 0.1 mSv
(10 days of radiation)
What is the aim to produce with all imaging procedures?
= an image contrast
The imaging technique emphasizes certain contrast characteristics of anatomical structures allowing us to differentiated structures and determine which structures are abnormal.
In x-rays what does denser material (bone) show up as ?
Denser material = white
(Rays are blocked from reaching the film)
In x-rays what does less dense material show up as ?
Less dense = black
What colour would gas, fat, water and soft tissue show up on an x-ray?
= Black and grey
What colour would bone or metal show up on an x-ray?
= White
