RDT 116 - FINALS

30問 • 1年前

ischial tiberosity

通報

問題一覧

Which artifact is corrected by swapping face in frequency directions?

Motion Artifact

What is the relationship between slice thickness and partial volume averaging

Thicker slices increases artifact

What is the primary solution for rf noise artifact?

Close MRI door

What artifact is related to improper shielding and appears as static on the image?

RF noise artifact

What is the main purpose of liquid helium in mri system?

To maintain superconductivity of the magnet

What type of magnet is commonly used in mri system?

Superconducting

What is the strength of the earths magnetic field compared to a typical mri scanner?

0.5 gaus/2 tesla

Potential for rf induce currents

How can non linearity in gradient speed corrected?

Use recomputed displacement tables

What type of rf coil is used for communication in hydrogen atom?

RF Transceiver Coil

What is the function of gradient coil in MRI?

Create variable magnetic field for spatial encoding

Which patient positioning artifacts occurs when molecules at 54.74° to the magnetic field?

Magic Angle

What is the typical appearance of magic angle artifact?

Bright signals at specific angles

What is the primary cause of rf crosstalk artifact?

Insufficient intervening of slices

What is the best initial step to reduce metal artifact?

Screen patients for metal objects

What causes of metal artifacts in MRI?

Ferromagnetic Material

How can RF related zipper artifacts be minimized?

Shift to central reference line

Which artifact is caused by overlapping anatomic structures within the same pixel?

Partial volume averaging

What is the common solution for moire fringes????

Use of autoshielding coils

What is the term for interference pattern seen in gradient echo images?

Moire fringes

How can magnetic susceptibility artifacts be reduce?

Strip for metallic objects

What causes magnetic susceptibility artifacts in mri?

Differences in tissue magnetic properties

How can eddy current artifact minimized?

Use of free emphasis techniques

What is the primary cause of eddy current artifact?

A sudden switching of gradients

What is the appearance of herringbone artifacts?

Screen door or fabric pattern

How can rf noise artifacts be corrected

Improve RF Shielding

What causes the rf noise artifacts

Improper RF Shielding

How can crosstalk artifact be minimized?

Decrease slice thickness by 30%

What is the cause of crosstalk artifact

Overlapping slice thickness

How can lead sheet angles???(ambot nasapawan ang voice ni mam) be corrected?

Use longer TE sequences

RDT 116 - MIDTERMS

ischial tiberosity · 40問 · 1年前

RDT 116 - MIDTERMS

40問 • 1年前

ischial tiberosity

RDT 115 - MIDTERMS

ischial tiberosity · 52問 · 1年前

RDT 115 - MIDTERMS

52問 • 1年前

ischial tiberosity

RDT 115 - FINALS

ischial tiberosity · 31問 · 1年前

RDT 115 - FINALS

31問 • 1年前

ischial tiberosity

問題一覧

Which artifact is corrected by swapping face in frequency directions?

Motion Artifact

What is the relationship between slice thickness and partial volume averaging

Thicker slices increases artifact

What is the primary solution for rf noise artifact?

Close MRI door

What artifact is related to improper shielding and appears as static on the image?

RF noise artifact

What is the main purpose of liquid helium in mri system?

To maintain superconductivity of the magnet

What type of magnet is commonly used in mri system?

Superconducting

What is the strength of the earths magnetic field compared to a typical mri scanner?

0.5 gaus/2 tesla

Potential for rf induce currents

How can non linearity in gradient speed corrected?

Use recomputed displacement tables

What type of rf coil is used for communication in hydrogen atom?

RF Transceiver Coil

What is the function of gradient coil in MRI?

Create variable magnetic field for spatial encoding

Which patient positioning artifacts occurs when molecules at 54.74° to the magnetic field?

Magic Angle

What is the typical appearance of magic angle artifact?

Bright signals at specific angles

What is the primary cause of rf crosstalk artifact?

Insufficient intervening of slices

What is the best initial step to reduce metal artifact?

Screen patients for metal objects

What causes of metal artifacts in MRI?

Ferromagnetic Material

How can RF related zipper artifacts be minimized?

Shift to central reference line

Which artifact is caused by overlapping anatomic structures within the same pixel?

Partial volume averaging

What is the common solution for moire fringes????

Use of autoshielding coils

What is the term for interference pattern seen in gradient echo images?

Moire fringes

How can magnetic susceptibility artifacts be reduce?

Strip for metallic objects

What causes magnetic susceptibility artifacts in mri?

Differences in tissue magnetic properties

How can eddy current artifact minimized?

Use of free emphasis techniques

What is the primary cause of eddy current artifact?

A sudden switching of gradients

What is the appearance of herringbone artifacts?

Screen door or fabric pattern

How can rf noise artifacts be corrected

Improve RF Shielding

What causes the rf noise artifacts

Improper RF Shielding

How can crosstalk artifact be minimized?

Decrease slice thickness by 30%

What is the cause of crosstalk artifact

Overlapping slice thickness

How can lead sheet angles???(ambot nasapawan ang voice ni mam) be corrected?

Use longer TE sequences