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MRI MCQS 1. An inversion recovery (IR) spin echo sequence begins with a:
a. 90° RF pulse
b. 180° RF pulse
c. 45° RF pulse
d. a or b
Answer- B
2. A typical spin echo (SE) sequence uses pulses:
a. 90°, 90°
b. 90°, 180°
c. 180°, 180°
d. 180°, 90°
Answer- B
3. A typical inversion recovery (IR) spin echo sequence uses pulses:
a. 90°, 180° , 180°
b. 180° , 90°, 180°
c. 5° RF pulse
d. a or b
Answer- B
4. T2-weighted fluid attenuated inversion recovery (FLAIR) sequences are typically
used for the evaluation of:
a. Musculoskeletal contusions
b. Fat
c. Retro-orbital fat
d. Periventricular white matter disease
Answer- D
5. A typical gradient echo sequence begins with a:
a. 90° RF pulse
b. 180° RF pulse
c. Alpha pulse that varies with desired image contrast
d. Alpha pulse below 10°
Answer- C
6. Short tau inversion recovery (STIR) sequences are typically used for the evaluation
of all of the following EXCEPT:
a. Musculoskeletal contusions
b. Fat suppression
c. Lesions within the retro-orbital fat
d. Fluid (CSF)
Answer- D
7. STIR sequences can suppress the signal from all of the following EXCEPT:
a. Fat within bone marrow
b. Gadolinium-enhancing lesions
c. Retro-orbital fat
d. Fluid (CSF)
Answer- D
8. To produce the echo, a gradient echo pulse sequence uses a:
a. Gradient magnetic field only
b. RF pulse only
c. Combination of a and b
c. Switching device
d. A combination of any two RF pulses
Answer- C
9. The 180° pulse that follows the initial 90° pulse in a spin echo sequence will cause
the NMR signal to reappear while correcting for:
a. Slight magnetic field inhomogeneities
b. Chemical shift
c. Slight magnetic susceptibility effects
d. All of the above
Answer- D
10. The gradient that is on during the production of the echo is called the
a. Phase encoding gradient
b. Slice select gradient
c. Frequency encoding gradient/readout gradient
d. Flow encoding gradient
Answer- C
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**** T cells themselves do not secrete antibodies but stimulate B cells to produce antibodies.
**** Alpha interferon destroys tumors by activating the immune system
**** Natural killer is a phagocyte of the cell. Large granular lymphocyte. ****Interferon virus is secreted by the infected cell.
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Which protein is secreted by viral infected cells which protect the infected cells from further viral infection?
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Q= Many parts of the body such as the oral cavity, stomach and vaginal tract prevent the growth of bacteria, which is...................Answer- acidic pH
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Q- What is present in bodily secretions such as tears, saliva, mucus and mucus that destroy bacteria? Lysozyme
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Q408- A patient is on DOTS therapy and his urine colour turned in to red, this happens due to intake of
