Parameters And Mri Trade-offs Quiz

In MRI scans, an increase in repetition time (TR) allows for better image quality by increasing signal-to-noise ratio (SNR), increasing the number of slices, longer scan time, and reducing T1 weighting. Decreasing any of these factors would not result in an increase in TR.

Decreasing TR in an MRI scan leads to an increase in T1 weighting, which enhances the contrast between different tissues in the image. This can be beneficial for certain imaging purposes.

Increasing TE results in a longer echo time and thus increases T2 weighting. However, increasing TE also leads to a decrease in signal-to-noise ratio (SNR) due to longer relaxation times.

Decreasing TE results in longer relaxation times which increases signal-to-noise ratio (SNR) and reduces T2 weighting in the MRI image.

Increasing NEX (number of excitations) in MRI imaging results in more signal averaging, leading to an increase in signal-to-noise ratio (SNR). However, this increase in SNR comes at the cost of a directly proportional increase in scan time.

When NEX (Number of Excitations) decreases in MRI imaging, it directly leads to a decrease in scan time. This decrease in scan time also results in a decrease in Signal-to-Noise Ratio (SNR) and the need for less signal averaging to achieve a clear image.

Increasing slice thickness in an MRI scan results in a trade-off between improved signal-to-noise ratio (SNR) and coverage of anatomy, but at the expense of decreased spatial resolution and increased partial voluming.

Decreasing slice thickness leads to higher spatial resolution by reducing the partial voluming effect, but it also reduces the signal-to-noise ratio (SNR) and limits the coverage of anatomy in each slice.

Increasing the Field of View (FOV) in imaging typically leads to an increase in Signal-to-Noise Ratio (SNR) and coverage of the anatomy, while simultaneously reducing spatial resolution and the likelihood of aliasing artifacts.

Decreasing FOV results in a higher resolution image, but may lead to an increased likelihood of aliasing and reduced coverage of anatomy.

Increasing the MATRIX in imaging leads to a trade-off between spatial resolution, scan time, and SNR depending on the size of the pixels involved.

Decreasing the MATRIX reduces the number of data points acquired during the scan, leading to a decrease in scan time. This can also improve Signal-to-Noise Ratio (SNR) when using smaller pixel sizes due to less averaging. However, decreasing the MATRIX typically results in a decrease in spatial resolution as fewer data points are used to reconstruct the image.

To increase receive BANDWIDTH in an MRI scan, one must reduce the chemical shift which in turn decreases the minimum TE and spatial resolution, allowing for greater bandwidth.

Decreasing bandwidth leads to a decrease in noise received along with the signal, therefore increasing the signal-to-noise ratio (SNR). This result is the opposite of an increase in chemical shift or a decrease in minimum TE, which do not directly affect SNR.

Large coils in MRI imaging are used to increase the area of received signal, which can help capture more data but at the cost of lower Signal-to-Noise Ratio (SNR). Additionally, large coils may be sensitive to aliasing artifacts when used with a small Field of View (FOV).

Using a small coil in MRI can improve the Signal-to-Noise Ratio (SNR) by decreasing the area of received signal, making it less sensitive to artifacts and less prone to aliasing when a smaller Field of View (FOV) is used.