= Serkan Ünlü
{c}
\b[<Serkan Ünlü>] investigates cardiac imaging and the dependence of measured <heart> function on image acquisition. His official institutional profile identifies <cardiology> as his unit and lists cardiac and cardiovascular research areas.<Serkan Ünlü academic profile at Gazi University>[General Information, institutional unit and research areas]{ref}
Ünlü is first author of a primary study testing <cardiac image foreshortening> in <echocardiography>. The investigators imaged 72 participants using a GE Vivid E9 system and deliberately collected altered apical views from a window one rib-space above the optimal position. They compared <ejection fraction> and longitudinal deformation measurements using two analysis systems.<Impact of apical foreshortening on deformation measurements: a report from the EACVI-ASE Strain Standardization Task Force by Serkan Ünlü and others>[Byline; Abstract, Methods and results]{ref} This is an experimental acquisition comparison: the view changes while the patient's chamber is not assumed to have become anatomically shorter.
An original geometric example shows why a constant scale error and a phase-dependent distortion have different consequences. Let a modeled chamber length change from $L_d=10$ to $L_s=8$ cm. Its fractional shortening is
$$
\varepsilon=\frac{L_s-L_d}{L_d}=-0.20.
$$
Multiplying both lengths by 0.9 leaves the ratio unchanged. If instead the measured lengths become 9 and 7 cm because the same 1 cm terminal segment is missed in each phase, the apparent fractional shortening is $-2/9\approx-0.222$. Neither model is a complete <echocardiography> reconstruction; they demonstrate why the error mechanism matters even in a normalized measurement.
The primary study found that deliberately foreshortened views changed measured deformation, with the effect differing by myocardial layer and analysis system.<Impact of apical foreshortening on deformation measurements: a report from the EACVI-ASE Strain Standardization Task Force by Serkan Ünlü and others>[Abstract, Results and Conclusion]{ref} Ünlü's documented contribution is to test that dependence experimentally. Repeatable software output does not establish that the acquired image represents the intended anatomical view.
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