Armrit stuvia - Study guides, Class notes & Summaries

MRI PHYSICS- Armrit Test Questions and Answers (Graded A) MRI PHYSICS- Armrit Test Questions and Answers (Graded A) MRI PHYSICS- Armrit Test Questions and Answers (Graded A) Signal - ANSWER-Current induced iby receiver coil. Also comes from the procession of protons in the patient. Chemical pre saturation - ANSWER-Selectively apply 90 degree pulse at frequency of tissue to be saturated. Moves fat or HBO 90 degrees. 2nd puse wider bandwidth moves both fat and water 90 degrees. One w...

An analogy for the decoding of the MR signal through Fourier Transform - ANSWER-Basilar membrane processing sound Logically each line of phase encoding data is combined to allow the FT to determine the position along the y-axis. The number of phase encoding steps determines - ANSWER-the number of pixels along the y-axis In a gradient echo pulse sequence, which flip angle will produce a T2 weighted gradient echo image. - ANSWER->20 - <45 degree flip angle In a horizontal magnet, wh...

The exact middle of the bore of the magnet is termed: - Answer Isocenter Without proper safety limits on the MR system exposure to the time-varying magnetic fields created by the rapid switching of the gradient could create a potential environment for: - Answer Including electrical current in the patient's tissues Faraday's Law deals with induction of a current by a magnet. true or false? - Answer true The orientation of the main magnetic field of a low field permanent magnet is verti...

ARMRIT Practice Tests with Complete Questions & Answers (Graded A) ARMRIT Practice Tests with Complete Questions & Answers (Graded A) ARMRIT Practice Tests with Complete Questions & Answers (Graded A) ARMRIT Practice Tests with Complete Questions & Answers (Graded A) ARMRIT Practice Tests with Complete Questions & Answers (Graded A) The 2 types of enhancement media described by Lauffer, the mechanism of T1 agents is - ANSWER-to decrease T1 relaxation time, thus emitting high signal An anal...

ARMRIT Review Test Questions & Answers 100% VerifiedARMRIT Review Test Questions & Answers 100% VerifiedARMRIT Review Test Questions & Answers 100% Verified The exact middle of the bore of the magnet is termed: - ANSWER-Isocenter Without proper safety limits on the MR system exposure to the time-varying magnetic fields created by the rapid switching of the gradient could create a potential environment for: - ANSWER-Including electrical current in the patient's tissues Faraday's Law ...

ATOMS - ANSWER-FUNDAMENTAL SUBMICROSCOPIC UNIT OF ALL MASS. SIZE OF THE ATOM AND ITS WEIGHT HAVE INTERESTED SCIENTISTS FOR A LONG PERIOD. SUBSEQUENTLY, EXPERIMENTS WERE DEVISED TO DETERMINE THE SIZE AND WEIGHT OF THE VARIOUS ATOMS. THE LIGHTEST OF ALL ATOMS IS HYDROGEN. PROTON - ANSWER-A SUBATOMIC PARTICLE HAVING A POSITVIE CHARGE IDENTICAL IN MAGNITUDE TO THE NEGATIVE CHARGE OF AN ELECTRON AND, TOGETHER WITH THE NEUTRON, A COMPONENT OF ALL ATOMIC NUCLEI. THE PROTON FORMS, BY ITSLEF, THE NUCL...

The 2 types of enhancement media described by Lauffer, the mechanism of T1 agents is - Answer to decrease T1 relaxation time, thus emitting high signal An analogy for the decoding of the MR signal through Fourier Transform - Answer Basilar membrane processing sound Logically each line of phase encoding data is combined to allow the FT to determine the position along the y-axis. The number of phase encoding steps determines - Answer the number of pixels along the y-axis In a gradient ech...

For the following spin-echo protocol: FOV: 320/ TR:500/ TE:25/ SliceThick.:5mm/ Slice Gap:1mm/ Slice.#:9/ NEX:4, Matrix:192 Decreasing TE will: a. Decrease the # of allowable slices. b. Increase the # of allowable slices. c. Increase scan time. d. Decrease scan time. - ANSWER-b. Increase the # of allowable slices. A linear relationship between frequency and position is superimposed on Bo by the Gp. The H protons' relative precessional frequencies determine: a. Phase coherence. b. Pha...

The tissue characteristic that depends heavily on the relative content of fat molecules and free water is: - ANSWER-Hydrogen concentration. T1 is the measurement of time for the longitudinal component of the net magnetization vector to recover what percentage of its original value after the application of a 90 degree radio-frequency pulse? - ANSWER-63% Immediately after an initial 90 degree radio-frequency pulse is turned off, the hydrogen protons will begin to: - ANSWER-Dephase A 90 de...

ARMRIT PHYSICS PRACTICE TEST WITH COMPLETE SOLUTIONS ARMRIT PHYSICS PRACTICE TEST WITH COMPLETE SOLUTIONS ARMRIT PHYSICS PRACTICE TEST WITH COMPLETE SOLUTIONS The tissue characteristic that depends heavily on the relative content of fat molecules and free water is: - ANSWER-Hydrogen concentration. T1 is the measurement of time for the longitudinal component of the net magnetization vector to recover what percentage of its original value after the application of a 90 degree radio...