EVALUATION OF MODEL-BASED ITERATIVE RECONSTRUCTION IN ABDOMINAL COMPUTED TOMOGRAPHY IMAGING AT TWO DIFFERENT DOSE...

Area of Science:

• Radiology
• Medical Imaging
• Radiation Dose Reduction

Background:

• Iterative reconstruction algorithms are crucial for optimizing CT image quality and radiation dose.
• iDose4 is a routinely used algorithm, while Model-based iterative reconstruction method (IMR) is a newer alternative.

Purpose of the Study:

• To qualitatively evaluate the performance of IMR compared to iDose4 for abdominal CT.
• To explore the potential for dose reduction in abdominal CT examinations.

Main Methods:

• A comparative study involving 34 patients undergoing abdominal CT.
• Low-dose scans (3.4 mGy) reconstructed with iDose4 and IMR were compared to standard-dose scans (5.3 mGy) reconstructed with iDose4.
• Radiologists used ViewDEX v2.0 and modified EU image criteria for visual grading.

Main Results:

• No statistically significant difference in image quality was found between standard-dose iDose4 and low-dose IMR in five of six evaluated criteria.
• iDose4 performed superiorly in one criterion.
• A potential radiation dose reduction of 35% is indicated when using IMR instead of iDose4.

Conclusions:

• IMR presents a promising alternative for substantial radiation dose reduction in abdominal CT.
• Careful consideration is needed for the visualization of adrenal glands when using IMR.