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N. J. Pelc is a coauthor with D. R. Enzmann of a 1991 study that used phase-contrast magnetic resonance imaging to measure cerebrospinal fluid motion through the cardiac cycle. The work illustrates how magnetic resonance imaging can provide a time-dependent physiological measurement rather than only an anatomical picture.^[ref]

The investigators studied ten healthy volunteers and four patients whose conventional magnetic-resonance images were normal. Peripheral cardiac gating divided the measurement into 16 flow-encoded images per cycle. The flow encoding distinguished opposite directions of cerebrospinal fluid motion, and measurements at several locations showed that the timing of the motion differed between the ventricular system and surrounding spaces.^[ref]

For an illustrative one-second cycle, 16 equally spaced phases would separate samples by $1/16=0.0625$ seconds. The paper's number of cardiac phases therefore matters: an average over the entire cycle could hide changes of direction within it. Conversely, sixteen phases are a temporal sampling scheme, not evidence of sixteen independent subjects. This example explains the measurement design without assigning an unreported individual contribution to either coauthor.

A 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.^[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.^[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.^[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.