Patient arm position during quantitative bone single-photon emission computed tomography/computed tomography...

Area of Science:

• Nuclear Medicine
• Radiology
• Medical Imaging

Background:

• Bone SPECT/CT imaging is crucial for diagnosing various musculoskeletal conditions.
• Patient positioning, particularly arm placement, can significantly impact image quality and diagnostic accuracy.
• Limited research exists on the optimal arm position for bone SPECT/CT, especially for patients with shoulder limitations.

Purpose of the Study:

• To evaluate the effect of different arm positions on bone SPECT/CT image quality and quantitative accuracy using a phantom.
• To determine the optimal arm position for acquiring high-quality and quantitatively reliable bone SPECT/CT images.

Main Methods:

• A phantom study was conducted with five simulated arm positions.
• SPECT data were acquired with varying projection times and reconstructed using Flash 3D.
• Image quality was assessed using contrast, noise, signal-to-noise ratios, visual scores, and quantitative metrics like recovery coefficient and RMSE.

Main Results:

• Arms-down positions yielded better spatial resolution and image quality compared to raised-arm positions, especially with simulated shoulder disorders.
• Raised arms increased image noise and decreased contrast, affecting quantitative accuracy (SUV values, RC, RMSE).
• The arms-down position demonstrated quantitative accuracy comparable to longer acquisition times.

Conclusions:

• Patient positioning with arms down is recommended for optimal bone SPECT/CT image quality and quantitative accuracy.
• This approach can facilitate imaging for patients experiencing shoulder pain or limited mobility.
• Standardizing arm position can enhance the reliability and diagnostic value of bone SPECT/CT scans.