MRI Study guides, Class notes & Summaries

A _____ can be used to administer nutrition or long-term chemotherapy Peg tube Chest tube Venous catheter J-tube - Venous catheter A common device used for high pressure steam sterilization is called the Thermal ventilator Vector chamber Autoclave Inhalator - Autoclave A magnetic field strength of 1T is equal to 1,000g 10,000g 100,000g 10g - 10,000g

All McLean Imaging Center (MIC) research personnel and all affiliated personnel wishing unsupervised access to Zone ____ and Zone ____ will be required to obtain an ____. - 1. Zone III 2. Zone IV 3. MR Environment safety Certification It is required that all scan-related operations involving human subjects maintain the continuous presence in Zone ____ of at least ____ individuals holding ____ as issued by the MIC and ____ certification as issued by an authorized entity. - 1. Zone III ...

What is the unit for magnetic field strength? CORRECT ANSWER 1T=10(kG)=10,000 G What type of artifact is seen exclusively in both phase and frequency directions? CORRECT ANSWER Aliasing What artifact is the result of the recessional difference between fat and water? CORRECT ANSWER Chemical shift The area in which a gradient magnetic field is equal to the external magnetic field is called CORRECT ANSWER Isocenter The loss of phase coherence due to intrinsic and extrinsic magnetic fiel...

Long term biologic effects for having a MRI scan are.... CORRECT ANSWER none MRI machine has a. static b. transient c. RF d. all of the above CORRECT ANSWER all of the above ACR guidelines for MRI safety include a. establish and maintain policies & procedures b. implement site access restrictions c. patient screen by qualified personnel d. all of the above CORRECT ANSWER all of the above Who is in charge of regulating medicines and medical devices? a. Medicines & healthcare r...

Magnetohydrodynamic effect CORRECT ANSWER When moving blood enters a magnetic field, an effect on the ECG seen as a "T wave swelling" or spike occurs, also known as Heart valves CORRECT ANSWER Which of the following implants would be considered acceptable for an MRI scan at 1.5Tesla? Warmth and/or increase in body temperature CORRECT ANSWER The effects of time varying magnetic fields can include all of the following EXCEPT: Epinephrine CORRECT ANSWER In the event that a patient develo...

when use of an MRI contrast agent causes tissue to appear brighter which of the following has occurred ? CORRECT ANSWER positive contrast relaxation centers are regions of CORRECT ANSWER increased magnetizatiom when exposed to intense static magnetic fields, filtered human cells.. CORRECT ANSWER show no effect the main potential for biological response from RF is CORRECT ANSWER tissue heating electric current density induced by transient magnetic fields is measured in CORRECT ANSWER ...

Which of the following implants may pose a problem during scanning? ntable drug infusion pumps b. cardiac pacemakers/breast tissue expanders c. bone growth stimulators d. all of the above CORRECT ANSWER D Which of the following could result from scanning a pt with a cardiac pacemaker? a. changes of programming b. induced current in the lead wire/pt burns c. pacemaker may become dislodged and pulled from pt's chest CORRECT ANSWER A and B Which of the following procedures would be a...

A patient arrives at the imaging facility with a crainal scar. The technologist should: A. wrap the head in a sterile dressing B. perform the MRI procedure immediately to document the patient's surgical history C. ignore the scar, it doesn't matter if the patient has had cranial surgery, as long as we are scanning another part of the patient's body D. screen the patient, their doctor, and/or family member to find out what type of surgery the patient underwent CORRECT ANSWER D. sc...

Perfusion weighted imaging shows: - ANSWER-blood flow to the brain capillary bed Diffusion imaging in the brain is used to evaluate the movement of: - ANSWER-water molecules When imaging the brain, which of the following is not an expected result after administering gadolinium? - ANSWER-enhanced cysts What are advantages of using gradient echo sequences? - ANSWER-faster scan times, 3-D acquisition & echo planar imaging What is often the first sign of small vessel occlusive disease? -...