MRI
In MRI safety labeling, which color represents an item that is completely safe in the MR environment?
Green
Who invented Computed Tomography (CT)?
Sir Godfrey Hounsfield
In which year were X-rays discovered?
1895
Ultrasound is defined as sound waves with frequency greater than?
20 kHz
Which non-invasive imaging technique can assess the hepatobiliary system without contrast injection?
MRCP
Which organ was scanned by the first CT scanner?
Brain
Which x ray interaction contributes most to scatter radiation?
compton scattering
In which medium does sound travel the fastest?
solid
Who is considered the father of MRI?
Raymond Damadian
Which CT generation uses a stationary detector ring?
fourth generation
What is the SI unit of radiation dose?
Rad/ Gray
What is the speed of sound in soft tissue?
1540 m/s
Which MRI field strength is increasingly used for research and advanced brain imaging?
7 Tesla
Which substance has a CT number of approximately +30 to +45 HU?
Blood
What is the approximate melting point of tungsten?
3422°C
Which type of probe is preferred for thyroid ultrasound?
Linear probe
Which implant material produces fewer MRI artifacts: titanium or stainless steel?
Titanium
In which year was the first clinical CT scanner introduced?
1971
What is the annual occupational dose limit for the lens of the eye?
20 mSv
what ultrasound technique is used to study blood flow?
Doppler