Editing CT scan (section)

=== Dual energy CT ===
Dual energy CT, also known as spectral CT, is an advancement of computed Tomography in which two energies are used to create two sets of data.<ref>{{Cite book |last1=Johnson |first1=Thorsten |url=https://books.google.com/books?id=Etvcnz0mjF4C&q=dual+energy+ct |title=Dual Energy CT in Clinical Practice |last2=Fink |first2=Christian |last3=Schönberg |first3=Stefan O. |last4=Reiser |first4=Maximilian F. |date=2011-01-18 |publisher=Springer Science & Business Media |isbn=978-3-642-01740-7}}</ref> A dual energy CT may employ dual source, single source with dual detector layer, single source with energy switching methods to get two different sets of data.<ref>{{Cite book |last1=Johnson |first1=Thorsten |url=https://books.google.com/books?id=Etvcnz0mjF4C&q=dual+energy+ct |title=Dual Energy CT in Clinical Practice |last2=Fink |first2=Christian |last3=Schönberg |first3=Stefan O. |last4=Reiser |first4=Maximilian F. |date=2011-01-18 |publisher=Springer Science & Business Media |isbn=978-3-642-01740-7 |page=8}}</ref>  

* '''Dual source CT''' is an advanced scanner with a two X-ray tube detector system, unlike conventional single tube systems.<ref>{{Cite book |last1=Carrascosa |first1=Patricia M. |url=https://books.google.com/books?id=wJ2oCgAAQBAJ&q=dual+source+ct |title=Dual-Energy CT in Cardiovascular Imaging |last2=Cury |first2=Ricardo C. |last3=García |first3=Mario J. |last4=Leipsic |first4=Jonathon A. |date=2015-10-03 |publisher=Springer |isbn=978-3-319-21227-2}}</ref><ref>{{Cite journal |last1=Schmidt |first1=Bernhard |last2=Flohr |first2=Thomas |date=2020-11-01 |title=Principles and applications of dual source CT |journal=Physica Medica |series=125 Years of X-Rays |volume=79 |pages=36–46 |doi=10.1016/j.ejmp.2020.10.014 |issn=1120-1797 |pmid=33115699 |s2cid=226056088|doi-access=free}}</ref> These two detector systems are mounted on a single gantry at 90° in the same plane.<ref name="auto1">{{Cite book |last1=Seidensticker |first1=Peter R. |url=https://books.google.com/books?id=oUtHea3ZnJ0C&q=dual+source+ct |title=Dual Source CT Imaging |last2=Hofmann |first2=Lars K. |date=2008-05-24 |publisher=Springer Science & Business Media |isbn=978-3-540-77602-4}}</ref> Dual source CT scanners allow fast scanning with higher temporal resolution by acquiring a full CT slice in only half a rotation. Fast imaging reduces motion blurring at high heart rates and potentially allowing for shorter breath-hold time. This is particularly useful for ill patients having difficulty holding their breath or unable to take heart-rate lowering medication.<ref name="auto1"/><ref>{{Cite journal |last1=Schmidt |first1=Bernhard |last2=Flohr |first2=Thomas |date=2020-11-01 |title=Principles and applications of dual source CT |url=https://www.physicamedica.com/article/S1120-1797(20)30257-X/abstract |journal=Physica Medica: European Journal of Medical Physics |volume=79 |pages=36–46 |doi=10.1016/j.ejmp.2020.10.014 |issn=1120-1797 |pmid=33115699 |s2cid=226056088|doi-access=free}}</ref>
* '''Single source with energy switching''' is another mode of dual energy CT in which a single tube is operated at two different energies by switching the energies frequently.<ref>{{Cite journal |last1=Mahmood |first1=Usman |last2=Horvat |first2=Natally |last3=Horvat |first3=Joao Vicente |last4=Ryan |first4=Davinia |last5=Gao |first5=Yiming |last6=Carollo |first6=Gabriella |last7=DeOcampo |first7=Rommel |last8=Do |first8=Richard K. |last9=Katz |first9=Seth |last10=Gerst |first10=Scott |last11=Schmidtlein |first11=C. Ross |last12=Dauer |first12=Lawrence |last13=Erdi |first13=Yusuf |last14=Mannelli |first14=Lorenzo |date=May 2018 |title=Rapid Switching kVp Dual Energy CT: Value of Reconstructed Dual Energy CT Images and Organ Dose Assessment in Multiphasic Liver CT Exams |journal=European Journal of Radiology |volume=102 |pages=102–108 |doi=10.1016/j.ejrad.2018.02.022 |issn=0720-048X |pmc=5918634 |pmid=29685522}}</ref><ref>{{Cite journal |last=Johnson |first=Thorsten R.C. |date=November 2012 |title=Dual-Energy CT: General Principles |url=https://www.ajronline.org/doi/10.2214/AJR.12.9116 |journal=American Journal of Roentgenology |volume=199 |issue=5_supplement |pages=S3–S8 |doi=10.2214/AJR.12.9116 |pmid=23097165 |issn=0361-803X}}</ref>