Optimization of the imaging quality of 64-slice CT acquisition protocol using Taguchi analysis: A phantom study

Area of Science:

• Medical Imaging
• Radiology
• Quantitative Analysis

Background:

• Assessing CT imaging quality is crucial for accurate diagnosis.
• Optimization of CT acquisition protocols can enhance diagnostic performance.
• The Taguchi method offers a systematic approach to optimize multiple parameters.

Purpose of the Study:

• To quantitatively evaluate and optimize the imaging quality of a 64-slice CT acquisition protocol.
• To determine the optimal combination of CT slice thickness, reconstruction filter, spiral pitch, and matrix size.
• To identify the dominant factors influencing CT phantom imaging quality.

Main Methods:

• A phantom simulating the adult abdomen was scanned using a Philips brilliance CT.
• Taguchi's L8(2(7)) orthogonal array was employed to optimize four factors: slice thickness, filter type, spiral pitch, and matrix size.
• Radiologists evaluated phantom images for line counts and signal-to-noise ratios (S/N) over three rounds.

Main Results:

• The optimal CT acquisition protocol was determined to be: 1-mm slice thickness, sharp filter, 1.172 spiral CT pitch, and 1024x1024 matrix size.
• The filter type and its interaction with slice thickness were identified as dominant factors influencing S/N.
• Spiral CT pitch and matrix size were found to be minor factors, not reaching statistical significance.

Conclusions:

• The Taguchi method effectively optimized 64-slice CT acquisition parameters for improved imaging quality.
• Filter type and slice thickness are critical parameters for enhancing CT image quality.
• Further investigation into the interaction effects of acquisition parameters is warranted.