Written exam Flashcards
4 modes of image production
- Transmission of energy= high energy photons
- Reflection of energy
- Emission of energy
- a,B,gamma positron radiation emission from radioisotopes
Emission of energy=
Radiofrequency signal emission from hydrogen atoms
Different tissues have different realignment frequencies
Best to worse spatial resolution
Radiography, Mammography Fluoroscopy CT (HRCT) MRI US Nuclear medicine (PET, SPECT)
5 principle densities
Metal Bone Air Fat Water
CT angio uses which contrast material?
Iodine
Gadolinium is used where?
MRI
US contrast material can be
Microbubble
Preferential contrast agent for gastrointestinal (GI) fluoroscopic examinations
Barium
Which modalities do not use ionizing radiation?
MRI
US
What does ionizing radiation mean?
A lot of energy that can cause free radical when heating human molecule
Which modality equals 250-3500 times the estimated dose equivalent of one XR
Interventional fluoroscopy
ALARA
As Low As Reasonably Achievable
Nuclear medicine- what kind of isotope do we use?
Unstable
Nuclear medicine- what is the most popular isotope?
Tc99
Radiopharmacutical in PET?
F18-FDG
Which is not a corposcular radiation? a B gamma Positron
gamma- it is a wave. Doesnt have a weight
High FDG uptake in which organ?
Brain
What determined the distribution of the radioisotope?
Biochemical characteristics decides on the distribution
Do prostate cancer show elevated FDG uptake?
No
Which pathologies show elevated FDG uptake?
Pneumonia
Colorectal cancer
Which pathology show high Radiopharmacutical uptake in case of bone scintigraphy?
Osteomyelitis
Bone fruction
Inflammation
All of them
What is not an indication for Thyroid scintigraphy?
Hypothyroidism
In which nuclear medicine therapy do we use?
a and B
What is an indication for myocardial scintigraphy?
Ischemic heart disease
Plannar gamma camera detects what kind of image?
2D
Which is indication for dynamic renal scintigraphy?
Impaired flow
Assesement of renal parenchyma
What is the half life of Tc99 in minutes?
360
What radiation does PET detects?
gamma
MR angiography- What type of contrast material should be used?
Gadolinium
MRCP=
MRI Cholangio-Pancreatography
MRCP uses which sequence?
T2W MRI
High signal in slow/static fluids
Best to worse spatial resolution is given by
Mammography (X-Ray) Fluoroscopy DSA CT, MRI US Nuclear med
TIPS
Tranjagular Intrahepatic Portosystemic Shunts
PTA
Percutaneus Transluminal Angioplasty
DSA
Digital Substraction Angiography
FLAIR is
Like T2 but fluids are dark
Which sequence can detect early ischemia?
DWI
