click below
click below
Normal Size Small Size show me how
Ch14 Instrumentation
RT 191A Week 02 Ch: 14 Instrumentation
Question | Answer |
---|---|
DICOM stands for Digital Imaging and Communications in Medicine. True or False? | TRUE |
The benefits of using DICOM does not include privacy protection of patient information. True or False? | FALSE |
Select all that appply: Low field are advantageous because: A. Allows faster scan times B. Requires cooling C. Low operating costs d. Better for claustrophobic patients. | C & D. Low field magnets are advantageous becausae they have low operating costs, and are better for claustrophobic patients. |
Which of the following requires a cryostat? A. superconductive magnet B. low field magnet C. permanent magnet D. electromagnet scanners | A. Superconductive magnet |
A magnetic field strength of 1.5 Tesla equals roughly to __________ Gauss. A. 1,500 B. 0.65 C.150 D.15,000 | D. 15,00 Gauss = 1.5T |
Which of the following scanner types have a magnetic field that is always present? A. permanent magnet B. Superconductive magnet C. electromagnet | A. Permanent magnet |
Which of the following scanner types requires a very stable scan room temperature and has low maintenance costs? A. electromagnet scanners B. superconductive magnet C. permanent magnet | C. Permanent magnet |
Which of the following scanner types can be unplugged? A. electromagnet scanners B. permanent magnet C. super conductive magnet | A. Electromagnet |
Which of the following scanner types has a limited field strength because the field strength is limited to how much electricity can flow through a wire? A. electromagnet scanners B. permanent magnet C. superconductive magnet | A. Electromagnet |
Which of the following scanner types is the loudest? A. electromagnet scanners B. permanent magnet C. superconductive magnet | C. Superconductive magnet |
Which of the following scanner types requires helium to cool the magnet? A. permanent magnet B. superconductive magnet C. electromagnet scanners | B. Superconductive magnet |
rue or False: Magnetic field homogeneity is required to increase the speed of the scan. | FALSE |
The amount of inhomogeneity acceptable for a magnetic field in MRI is: A. 4 PPM B. 3.5 PPM C. 2.5 PPM D. 5 PPM | B. 3.5 ppm |
The process of installing metal plates within the walls of the MRI scanner to homogenize the magnetic field is called: A. passive shielding B. active shimming C.passive shimming D. active shielding | C. Passive shimming |
An MRI Technologist can perform which type of shimming? A. active B. passive | A. Active |
Gradient coils manipulate B0: A. linearly B. negatively C. exponentially D. positively | A. Linearly |
How many gradient coils does an MRI scanner contain? A. 2 B. 3 C. 1 D. 4 | B.3 |
Gradient coils generate a magnetic field called a(n): A. RF field B. gradient field C. static field D. linear field | B. Gradient field |
Gradient rise time indicates: A. time taken to physically raise the gradients B. time taken to reach 100% strength C. reach max gradient strength D. time taken to change the main magnetic field linearly | D. time taken to change the main magnetic field linearly |
Select all that apply... An RF pulse does which of the following tasks: A. prevents claustrophobia B. puts hydrogens into the same phase C. puts hydrogens into the same frequency D. excites hydrogen atoms | B, C & D: B. puts hydrogens into the same phase, puts hydrogens into the same frequency, excites hydrogen atoms |
True, or False: An RT transmitter coil transmits an RF pulse into the patient. | TRUE |
True or False: A receiver coil can be built into the scanner bore wall. | FALSE |