Enhanced Reader Confidence and Differentiation of Calcification from Cerebral Microbleed Diagnosis Using QSM Relative...

Area of Science:

• Radiology
• Neuroimaging
• Medical Physics

Background:

• Cerebral microbleeds (CMBs) are crucial indicators for various neurological conditions.
• Distinguishing CMBs from calcifications on MRI is diagnostically challenging.
• Accurate identification of CMBs is vital for patient diagnosis and management.

Purpose of the Study:

• To compare the diagnostic performance of quantitative susceptibility mapping (QSM) and susceptibility weighted imaging/phase (SWI/P) for differentiating CMBs from calcifications.
• To assess the accuracy, confidence, and agreement levels of neuroradiologists using these two MRI sequences.
• To evaluate the predictability of mean susceptibility values in lesion classification.

Main Methods:

• A retrospective study involving 49 adult patients who underwent 3T MRI with multi-echo 3D GRE sequences.
• Generation of both QSM and SWI/P images from the acquired MRI data.
• Classification of 53 lesions by an expert panel, followed by independent review and classification by three neuroradiologists using a 5-point Likert scale.

Main Results:

• Quantitative susceptibility mapping (QSM) demonstrated superior performance over SWI/P in all measured metrics, including accuracy, confidence, and inter-rater agreement.
• Logistic regression analysis of QSM data showed near-perfect separation between CMBs and calcifications.
• QSM provided high predictability for differentiating between CMBs and calcifications.

Conclusions:

• Quantitative susceptibility mapping (QSM) is a more effective sequence than SWI/P for detecting and classifying cerebral microbleeds (CMBs).
• QSM improves diagnostic confidence and simplifies the interpretation workflow by requiring fewer images.
• QSM offers enhanced detectability and classification accuracy for CMBs, aiding in differential diagnosis.