{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,23]],"date-time":"2025-09-23T14:51:13Z","timestamp":1758639073180},"reference-count":18,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2009,11,24]],"date-time":"2009-11-24T00:00:00Z","timestamp":1259020800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Medical Physics"],"published-print":{"date-parts":[[2009,12]]},"abstract":"Purpose:<\/jats:title>Cardiac CT achieves its high temporal resolution by lowering the scan range from to plus fan angle (partial scan). This, however, introduces CT\u2010value variations, depending on the angular position of the range. These partial scan artifacts are of the order of a few HU and prevent the quantitative evaluation of perfusion measurements. The authors present the new algorithm partial scan artifact reduction (PSAR) that corrects a dynamic phase\u2010correlated scan without a priori<\/jats:italic> information.<\/jats:p><\/jats:sec>Methods:<\/jats:title>In general, a full scan does not suffer from partial scan artifacts since all projections in [0,] contribute to the data. To maintain the optimum temporal resolution and the phase correlation, PSAR creates an artificial full scan by projectionwise averaging a set of neighboring partial scans from the same perfusion examination (typically phase\u2010correlated partial scans distributed over and ). Corresponding to the angular range of each partial scan, the authors extract virtual partial scans from the artificial full scan . A standard reconstruction yields the corresponding images , , and . Subtracting the virtual partial scan image from the artificial full scan image yields an artifact image that can be used to correct the original partial scan image: , where is the corrected image.<\/jats:p><\/jats:sec>Results:<\/jats:title>The authors evaluated the effects of scattered radiation on the partial scan artifacts using simulated and measured water phantoms and found a strong correlation. The PSAR algorithm has been validated with a simulated semianthropomorphic heart phantom and with measurements of a dynamic biological perfusion phantom. For the stationary phantoms, real full scans have been performed to provide theoretical reference values. The improvement in the root mean square errors between the full and the partial scans with respect to the errors between the full and the corrected scans is up to 54% for the simulations and 90% for the measurements.<\/jats:p><\/jats:sec>Conclusions:<\/jats:title>The phase\u2010correlated data now appear accurate enough for a quantitative analysis of cardiac perfusion.<\/jats:p><\/jats:sec>","DOI":"10.1118\/1.3259734","type":"journal-article","created":{"date-parts":[[2009,11,24]],"date-time":"2009-11-24T23:37:16Z","timestamp":1259105836000},"page":"5683-5694","source":"Crossref","is-referenced-by-count":21,"title":["Partial scan artifact reduction (PSAR) for the assessment of cardiac perfusion in dynamic phase\u2010correlated CT"],"prefix":"10.1002","volume":"36","author":[{"given":"Philip","family":"Stenner","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bernhard","family":"Schmidt","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Herbert","family":"Bruder","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas","family":"Allmendinger","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ulrike","family":"Haberland","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas","family":"Flohr","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marc","family":"Kachelrie\u00df","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2009,11,24]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00330\u2010005\u20102919\u20102"},{"key":"e_1_2_7_3_1","unstructured":"2009 SPIE Bellingham WA H. 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