Podcast
Questions and Answers
Which artifact causes the misplacement of signal from fat in the image?
Which artifact causes the misplacement of signal from fat in the image?
- Partial volume artifact
- Motion artifact
- Chemical shift artifact (correct)
- Aliasing artifact
What can chemical shift artifact create in areas where fat and water interface?
What can chemical shift artifact create in areas where fat and water interface?
- Signal superimposition
- Signal enhancement
- Both signal voids and signal superimposition (correct)
- Signal voids
What is the appearance of chemical shift artifact in the image?
What is the appearance of chemical shift artifact in the image?
- Signal blurring
- Signal enhancement
- Signal loss (correct)
- Signal distortion
What is the artifact often referred to as?
What is the artifact often referred to as?
What is the cause of chemical shift artifact?
What is the cause of chemical shift artifact?
What is the difference in the precessional frequencies between magnetic moments in fat and water called?
What is the difference in the precessional frequencies between magnetic moments in fat and water called?
What is the overall appearance of chemical shift artifact in the image?
What is the overall appearance of chemical shift artifact in the image?
What does fat consist of?
What does fat consist of?
What is the term used to describe triglyceride fat molecules as a result of self-shielding?
What is the term used to describe triglyceride fat molecules as a result of self-shielding?
What is the term used to describe the lowering of the Larmor frequency of the magnetic moments of hydrogen nuclei in fat?
What is the term used to describe the lowering of the Larmor frequency of the magnetic moments of hydrogen nuclei in fat?
Which unit is used to express the amount of chemical shift?
Which unit is used to express the amount of chemical shift?
What is the value of the chemical shift between fat and water?
What is the value of the chemical shift between fat and water?
At 1.5 T, what is the difference in precessional frequency between fat and water?
At 1.5 T, what is the difference in precessional frequency between fat and water?
At 1.0 T, what is the difference in precessional frequency between fat and water?
At 1.0 T, what is the difference in precessional frequency between fat and water?
At lower field strengths (0.5 T or less), what is the difference in precessional frequency between fat and water?
At lower field strengths (0.5 T or less), what is the difference in precessional frequency between fat and water?
What causes chemical shift artifact in MRI images?
What causes chemical shift artifact in MRI images?
What determines the bandwidth of each pixel in an MRI image?
What determines the bandwidth of each pixel in an MRI image?
At a field strength of 1.5 T, how many pixels apart are fat and water protons mapped if the individual frequency range of each pixel is 125 Hz?
At a field strength of 1.5 T, how many pixels apart are fat and water protons mapped if the individual frequency range of each pixel is 125 Hz?
At an FOV of 240 mm and 256 frequency columns, what is the pixel size?
At an FOV of 240 mm and 256 frequency columns, what is the pixel size?
At a receive bandwidth of 32 KHz and 256 frequency pixels, what is the bandwidth of each pixel?
At a receive bandwidth of 32 KHz and 256 frequency pixels, what is the bandwidth of each pixel?
