= Radiologist
A \b[radiologist] is a physician specializing in diagnosis and treatment using medical imaging. The role includes choosing or advising on suitable imaging methods, interpreting measurements in anatomical and clinical context, and communicating their significance. Some <radiologists> also perform procedures under imaging guidance through <interventional radiology>.<What does a radiologist do? by RadiologyInfo.org>[Professional-society account of physician interpretation, collaboration and minimally invasive procedures.]{ref}
The distinction from image acquisition matters. A <radiologic technologist> often operates the acquisition equipment, while a <radiologist> interprets the resulting images and relates them to the question being investigated. The work is collaborative; neither the instrument's output nor a single visual feature automatically supplies a diagnosis.<What does a radiologist do? by RadiologyInfo.org>[Your Radiologist and the description of the healthcare team.]{ref}
A scientific example is phase-encoded imaging of <cerebrospinal fluid>. <D. R. Enzmann> and collaborators used a sequence synchronized to the <cardiac cycle> to distinguish motion in different fluid spaces. Interpretation required more than recognizing their outlines: opposite flow directions and different timing provided information about fluid dynamics.<Normal flow patterns of intracranial and spinal cerebrospinal fluid defined with phase-contrast cine MR imaging by D. R. Enzmann and others>[Abstract: 16 flow-encoded images per cardiac cycle and compartment-dependent timing.]{ref}
This illustrates the role's technical content: understand which physical quantity an image encodes, separate acquisition artifacts from biological structure or motion, and state what the evidence supports. A bright pixel can have different meanings in different imaging sequences.
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