MRSO FINAL EXAM WITH QUESTIONS AND ANSWERS | LATEST ANSWERS GRADED A+

MRSO FINAL EXAM WITH QUESTIONS AND ANSWERS | LATEST ANSWERS GRADED A+. How can we reduce risks associated with Lenz's force? A. No risks are associated with Lenz's force. B. Use a cold compress to reduce heating. C. Move as quickly as possible to get the patient out of the scanner quickly. D. Advance patient into the scanner slowly. - Answer D. Advance Patient into the scanner slowly. An implant has a deflection of 23 degrees. In terms of static magnetic fields, is it safe for this patient to have an MRI? A. Yes B. Must call the manufacture to determine conditions. C. No D. Not enough information. - Answer A. Yes Which of the following stainless steels are non-ferrous? A. Ferritic B. Martensitic C. Austenitic D. All are ferrous - Answer C. Austenitic It is not safe for a patient to cross over the 5 gauss line. How many millitesla is this? A. 0.5mT B. 5mT C. 50mT D. 0.005mT - Answer A. 0.5mT A patient is placed in a magnetic field that changes over a distance from the MR unit. What do we need in order to meet the manufacture limits if a patient with an implant will be safe from the threats associated with the static magnetic field prior to their MRI. A. Spatial gradient map. B. Compression C. The MRSO sole approval. D. All of the choices. - Answer A. Spatial gradient map The spatial gradient of 1.5 T MR unit, not the maximum spatial gradient has a lower spatial gradient than a 3.0 T MR unit. A. True B. False - Answer B. False Which of the following are documented biological effects associated with the static magnetic field? A. Magnetophosphenes B. Magnetohydrodynamic Effect C. Headaches D. Difficulty breathing - Answer A. Magnetophosphenes, B. Magnetohydrodynamic Effect and C. Headaches. What is the purpose of the time-varying gradient magnetic field? A. To produce resonance in our hydrogen nuclei B. To change the precessional speeds of hydrogen C. To produce net magnetism D. To form an image. - Answer B. To change the precessional speeds of hydrogen. The effect of the time-varying gradient is greatest where? A. Periphery of the patient. B. At isocenter C. At the 5-gauss line. D. Outside the MR room. - Answer A. Periphery of the patient. The X coil will produce what plane of image? A. Coronal images B. Axial images C. Sagittal images D. Oblique images - Answer C. Sagittal images Slew rate is measured in what? A. T/m/s B. mT C. Seconds D. Watts/kg - Answer A. T/m/s What will happen if we increase the slope of the gradient coils? A. The safety concerns associated with the time-varying gradient coils increase. B. The gradient coils must work harder. C. Resolution will increase. D. All the choices - Answer D. All the choices If we run a pulse sequence that is heavier on the gradient coils, what would we expect to happen to the noise heard during a scan? A. Get louder B. Get quieter C. Produce magnetic induction, but no noise. D. No noise will be heard - Answer A. It will get louder. If the slope of the gradient coils increases, which of the following will worsen? A. Patient heating B. Magnetohydrodynamic effect C. Peripheral nerve stimulation D. All of the Above - Answer C. Peripheral nerve stimulation What is used to determine how much noise reduction an earplug prevent? A. NRR B. Decibel C. Hertz D. Watts - Answer A. NRR Which of the following will produce more perpheral nerve stimulation? A. Increasing the image matrix B. Decreasing the field of view C. Use a gradient echo sequence D. All of the choices - Answer D. All of the choices. What is the unit of measurement of the time-varying gradient magnetic field? A. Decibels B. Mega hertz C. Watts/kg D. Tesla - Answer B. Mega hertz The radiofrequency transmitter emits what? A. A very rapidly changing magnetic field. B. A slowly changing magnetic field. C. A static magnetic field D. All of the choices. - Answer A. A very rapidly changing magnetic field. When RF energy is emitted, Faraday's low of induction says that____ can be created in electrically conductive materials? A. Rotational forces B. Translational forces C. Electrical fields D. None of the choices - Answer C. Electrical fields Electrical fields can only be produced in objects that are what? A. Plastic B. Exposed to RF fields C. Small D. Ferromagnetic - Answer B. Exposed to RF fields Which of the following is used to estimate body heating? A. SAR B. Decibels C. Hertz D. Watts - Answer A. SAR Using a fan to cool a patient is an example of which of the following? A. Conduction B. Evaporation C. Radiation D. Convection - Answer D. Convection