QuestionJune 18, 2025

Decrease the receive bandwidth from 32kHzarrow 16kHz Increase spatial resolution Decrease spatial resolution Increase SNR Increase scan time Decrease SNR

Decrease the receive bandwidth from 32kHzarrow 16kHz Increase spatial resolution Decrease spatial resolution Increase SNR Increase scan time Decrease SNR
Decrease the receive bandwidth from 32kHzarrow 16kHz Increase spatial resolution Decrease spatial resolution Increase SNR Increase scan time Decrease SNR

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Answer

Decrease bandwidth to increase SNR and scan time; increase spatial resolution reduces SNR; decrease spatial resolution increases SNR; increase scan time improves SNR; decrease SNR by increasing bandwidth or reducing voxel size. Explanation 1. Decrease Receive Bandwidth Reducing the receive bandwidth from 32 \text{kHz} to 16 \text{kHz} increases the signal-to-noise ratio (SNR) because **SNR is inversely proportional to the square root of the bandwidth**. This also increases scan time due to longer acquisition times. 2. Increase Spatial Resolution Increasing spatial resolution requires smaller voxel sizes, which can be achieved by increasing the matrix size or decreasing the field of view (FOV). This typically decreases SNR because **SNR is proportional to the voxel volume**. 3. Decrease Spatial Resolution Decreasing spatial resolution involves larger voxel sizes, which increases SNR as **SNR is proportional to the voxel volume**. It may also reduce scan time since fewer data points are needed. 4. Increase SNR To increase SNR, you can decrease the bandwidth, increase voxel size, or increase the number of averages. Each method has trade-offs with scan time and resolution. 5. Increase Scan Time Increasing scan time can be achieved by increasing the number of averages or reducing bandwidth. Both methods improve SNR but may affect patient comfort and throughput. 6. Decrease SNR Decreasing SNR can occur by increasing bandwidth, reducing voxel size, or decreasing the number of averages. These changes often lead to faster scans or higher resolution at the cost of image quality.

Explanation

1. Decrease Receive Bandwidth<br /> Reducing the receive bandwidth from $32 \text{kHz}$ to $16 \text{kHz}$ increases the signal-to-noise ratio (SNR) because **SNR is inversely proportional to the square root of the bandwidth**. This also increases scan time due to longer acquisition times.<br /><br />2. Increase Spatial Resolution<br /> Increasing spatial resolution requires smaller voxel sizes, which can be achieved by increasing the matrix size or decreasing the field of view (FOV). This typically decreases SNR because **SNR is proportional to the voxel volume**.<br /><br />3. Decrease Spatial Resolution<br /> Decreasing spatial resolution involves larger voxel sizes, which increases SNR as **SNR is proportional to the voxel volume**. It may also reduce scan time since fewer data points are needed.<br /><br />4. Increase SNR<br /> To increase SNR, you can decrease the bandwidth, increase voxel size, or increase the number of averages. Each method has trade-offs with scan time and resolution.<br /><br />5. Increase Scan Time<br /> Increasing scan time can be achieved by increasing the number of averages or reducing bandwidth. Both methods improve SNR but may affect patient comfort and throughput.<br /><br />6. Decrease SNR<br /> Decreasing SNR can occur by increasing bandwidth, reducing voxel size, or decreasing the number of averages. These changes often lead to faster scans or higher resolution at the cost of image quality.
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