Assessing breast MRI image quality: the bMRI-QUAL scoring system

Area of Science:

• Radiology
• Medical Imaging
• Quality Assurance

Background:

• Breast MRI (bMRI) performance is highly dependent on image quality, which can be affected by patient and technical factors.
• Image artifacts in bMRI can significantly reduce diagnostic sensitivity and specificity.
• A standardized scoring system is needed to objectively assess bMRI quality and guide decisions on scan adequacy.

Purpose of the Study:

• To develop and validate a reproducible quality scoring system for the standard breast MRI protocol, termed bMRI-QUAL.
• To assess the inter-reader reproducibility of the bMRI-QUAL system.
• To evaluate the overall image quality of breast MRI examinations at a tertiary cancer center using the developed system.

Main Methods:

• A 4-point scale was used by two experienced readers to evaluate individual sequences of 133 breast MRI examinations.
• A weighted formula incorporating sequence-specific clinical relevance was applied to generate a global score (GS) from 0 to 10.
• Bland-Altman analysis and coverage probability were used to assess inter-reader agreement and reproducibility.

Main Results:

• The mean global score (GS) assigned by readers was 8.3 ± 1.0, indicating good to excellent image quality.
• Approximately 77% of examinations received a GS of 7 or higher from both readers.
• The bMRI-QUAL system demonstrated good reproducibility, with a bias of -0.12 and limits of agreement of -2.52 to +2.29 between readers. The average evaluation time was 3 minutes per examination.

Conclusions:

• The bMRI-QUAL system is a reproducible and efficient tool for assessing breast MRI image quality.
• Breast MRI image quality at the studied tertiary cancer center is generally good to excellent.
• bMRI-QUAL can facilitate quality assurance and support clinical decisions regarding scan adequacy and potential repeat scans.