The NMV is rotated to the physical negative Z axis by applying a...? - C)180 pulse
Increasing which parameter is considered the "best" technique for improving image quality? - C)NEX
Studies have concluded that static magnetic fields up to what tesla produce no substantial harmful
biological effe...
ARMRIT Exam (you ain't failing) Questions with 100% Correct Answers | Updated & Verified | 2024 The NMV is rotated to the physical negative Z axis by applying a...? - ✔✔C)180 pulse Increasin g which parameter is considered the "best" technique for improving image quality? - ✔✔C)NEX Studies have concluded that static magnetic fields up to what tesla produce no substantial harmful biological effects. - ✔✔C)2.0 Tissues that have low (short) relaxation times have: - ✔✔Higher relaxation rates Nuclei in their natural enviroment ( in the absence of a significant magnetic field) are aligned... - ✔✔Randomly Following the injection of a gadolinium enhancement agent, t he pulse sequence most commonly employed is a... - ✔✔C)T1 weighted Employing a pulse sequence with a long TR & a long TE will result in tissues with a short T2 value appearing WHAT & tissues with a long T2 appearing WHAT on the resultant image. - ✔✔D)Dark /bright Which gradient axis direction is typically (for educational purposes) designated as the slice selection gradient? - ✔✔C)Logical Z gradient Electromagnetic coils placed strategically to contain the fringe fields. - ✔✔2)Active shielding 1 millilit er of H2O contains how many hydrogen protons? - ✔✔6 ×10 to th 23power Which of the following statements is true for gadolinium MRI IV enhancement products? - ✔✔B) produces randomly fluctuating magnetic fields in its immediate enviroment. The maximum expo sure to radiofrequency in 1 gram of tissue is: - ✔✔D) a maximum spatial peak of 8 w/kg Currently, patients & personnel arr exluded from exposure to MRI for the 1st trimester of pregnancy. - ✔✔True The maximum exposure to radio frequency averaged over the head is: - ✔✔B)No more than 3.2 w/kg The recieve signal amplitude for a pixel usually depends on thr substance's... - ✔✔A) T1, T2 , proton density Small magnetic field intoduced to the hydrogen protons in order to cause them yo move from the low energy state to the high energy state is... - ✔✔C) RF pulse at any one time, human body tissue, in general, is made up of 50% -90% of what substance? - ✔✔Hydrogen. once the patient's area of interest is placed in the main magnetic field of the MRI system, the hy drogen protons will... - ✔✔precess parallel to B sub zero In most tissues hydrogen concentration varies - ✔✔10% - to 15% 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? - ✔✔63% because of the spinning motion of the hydroge n proton, it has the same properties as a bar magnet. the hydrogen proton spinning motion gives it a... - ✔✔magnetic moment Magnetic resonance imaging is derived from the process known as... - ✔✔Nuclear magnetic resonance normally enhancing structures po st gadolinium - ✔✔choroid plexus because of only a 10% to 15% variation in most tissues, the tissue character that does not provide much contrast resolution... - ✔✔hydrogen concentration An inversion recovery pulse sequence can be which of the following? - ✔✔ACC RF. average over the whole body is answer 1. averaged over the head is answer 2. in one gram (1gr) of tissue is answer 3. - ✔✔1.C) no more than 0.4 w/kg 2.A) no more than 3.2w/kg 3.B) maximum spatial peak if 8 w/kg on T1 weighted images sub -acute hemorrhage will appear bright? - ✔✔TRUE which characteristic of tissue, in MRI, is the result of fast transition phenomenon &/or entry phenomenon? - ✔✔flow/velocity effects radio frequency RF coils that are placed close to the patient's body specifica lly for structures that are superficial & are receive coils only are... - ✔✔surface coils chemical shift artifacts will show up on the image in what gradient direction? - ✔✔B) frequency encoding coils that superimpose small magnetic fields within the patient during the MRI process & allow for special encoding are... - ✔✔gradient coils In an Inversion Recovery pulse sequence what TI will produce STIR fat -suppressed pulse sequence? - ✔✔80-120 The Larmor precessional or resonance frequency of hydrogen protons in a static magnetic field of 0.5 is approximately... - ✔✔21.288 MHz
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