Task A: Image Quality Assessment - Select the Superior Image
Please consider the following key quality attributes when evaluating the images:
Artifacts: Distortions or errors in the image that are not related to the subject's anatomy (e.g., motion ghosting in MRI, metal streaks in CT, ring artifacts). These can obscure or be mistaken for pathology.
Blur: Lack of sharpness or distinctness of image details (e.g., from patient/probe motion or focus issues in endoscopy/ultrasound). Subtle pathologies may be missed if fine textures are blurred.
Noise: Random variations in pixel intensity that degrade image quality (e.g., speckle noise in ultrasound, photon shot noise in low-dose imaging). Excessive noise can obscure anatomical boundaries.
Contrast and Illumination: The difference in visual properties that makes an object distinguishable from other objects and the background. Poor local contrast or uneven illumination (e.g., bias fields in MRI) can reduce the visibility of lesions and edges.
Region of Interest (ROI) Visibility: The clarity and discernibility of clinically relevant structures (e.g., tumors, vessels, organs, specific tissues). This plays a vital role in perceived image quality and diagnostic confidence.