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MRI Parameters and Trade-offs

meganpm 10 preguntas

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Preguntas del test (10)

  1. 1The scan time for a 3D acquisition is given by:
    1. ATR X NEX X phase encodings X number of slices
    2. BTR X NEX X phase encodings X slice thickness
    3. C(TR X NEX X phase encodings)/echo train length
    4. DTR X NEX X phase encodings
  2. 2The scan time for a 2D acquisition is determined by:
    1. ATR X NEX X phase encodings X FOV
    2. BTR X NEX X phase encodings X number of slices
    3. CTR X NEX X phase encodings X slice thickness
    4. DTR X NEX X phase encodings
  3. 3During a conventional spin echo exam, one line of k-space is filled each
    1. Afrequency encoding period
    2. BTE period
    3. CTR period
    4. DTI period
  4. 4Noise represents
    1. Acurrent induced in the phase encoding gradient
    2. Bfrequencies that exist randomly in space and time
    3. Cfrequencies that exist in a structured environment at a specific location
    4. DUn-captured voltage potential
  5. 5Changing the size of a voxel in the frequency direction will
    1. Ahave no effect on the scan time
    2. Bdouble the scan time
    3. Cincrease the scan time by a factor of 0.5
  6. 6What is the slice thickness for an isotropic voxel with a 20 cm field of view and a 256 X 256 matrix
    1. A13 cm
    2. B0.8 mm
    3. C3 cm
    4. D1.3 mm
  7. 7Where in a spin echo pulse sequence are pre-saturation pulses usually placed?
    1. Aafter the excitation pulse
    2. Bafter the 180 degree RF pulse
    3. Cbetween the 90 degree and 180 degree RF pulse
    4. Dprior to the excitation pulse
  8. 8Which of the following TR parameters will provide the highest signal to noise?
    1. A1800 ms
    2. B400 ms
    3. C2500 ms
    4. D800 ms
  9. 9Which of the following TE parameters will provide the highest signal to noise?
    1. A120 ms
    2. B20 ms
    3. C40 ms
    4. D80 ms
  10. 10Which of the following flip angles will provide the highest signal to noise?
    1. A45 degrees
    2. B115 degrees
    3. C90 degrees
    4. D5 degrees

Información

Descripción
Test sobre MRI Parameters and Trade-offs, creado por meganpm el 04/04/2015.
Autor
meganpm
Idioma
English
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Etiquetas
mri
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