The MRI signal originates:
A. ) from the emission of energy as the spins relax from the high energy state to the low energy state
B. ) from current induced in the receive coil by net magnetization precessing in the transverse plane
C. ) from current induced in the receive coil by magnetization relaxing along the Z-axis
查看答案
At an applied field strength of 1.5 Tesla, the water proton Larmor frequency is approximately 63 MHz. At 7 Tesla, the proton Larmor frequency would be:
A. ) the same, 63 MHz
B. ) 294 MHz
C. ) 13.5 MHz
Which imaging modality uses Huntsfield units (HU)?
A. Ultrasound imaging
B. Optical imaging
Computed tomography
What is the main advantage of CT imaging over X-ray imaging?
A. CT makes 3D imaging possible
B. CT delivers higher radiation dose to patients than X-ray imaging
CT delivers lower radiation dose to patients than X-ray imaging
Which of the following statements is true (only one answer is correct):
A. a) A CT pulmonary angiogram is the most accurate method to diagnose pulmonary embolism.
B. b) A chest CT scan is the only imaging tool used to diagnose heart diseases.
C. c) CT cannot be used for diagnosis of coronary artery calcification.
微信支付 
支付宝支付