Title Reformacijske tehnike kod kompjuterizirane tomografije Title (english) COMPUTED TOMOGRAPHY REFORMATION TECHNIQUES Author Marina Petričević Mentor Ivana Štula (mentor)Committee member Ivana Štula (član povjerenstva)Committee member Tade Tadić (član povjerenstva)Committee member Sanja Lovrić Kojundžić (predsjednik povjerenstva)Granter University of Split Defense date and country 2019-07-12, Croatia Scientific / art field, BIOMEDICINE AND HEALTHCARE Abstract Intezivnim razvojem tehnologije te pojavom digitalizacije mogućnosti medicinske radiologije rastu iz dana u dan. Od razvoja klasičnog skenera kompjutorizirane tomografije kao prve digitalne radiološke metode, pa do razvoja najmodernijih višedetektorskih ili višeslojnih spiralnih CT uređaja. Nadalje, razvojem sve boljih računala i softvera za obradu podataka, unaprijeđeni su i procesi rekonstrukcije slike, ali se i pojavljuju nove aplikacije reformacijskih tehnika za obradu slika. Iako se na CT
... More skeneru snimanja obavljaju u tradicionalnim aksijalnim presjecima, uz pomoć multiplanarnih reformacija možemo snimani objekt prikazati i u drugim ravninama. Osim osnovnih anatomskih ravnina, sagitalna i koronarna, u dijagnozi mogu pomoći presjeci i u kosoj i zakrivljenoj ravnini. Poznavajući informacije o vrijednostima atenuacije zračenja unutar piksela i voksela, reformacijama, kao što su MIP (Maximum Intensity Projection) i MinIP (Minimum Intensity Projection), možemo postići bolji prikaz struktura viših odnosno nižih atenuacijskih vrijednosti. Metode poput VRT (Volume Rendering Tehnique) i SSD (Shaded Surface Display) pružaju trodimenzionalan prikaz objekta od interesa. Dalje, procesom segmentacije odabiremo strukturu koja nas zanima ili možemo ukloniti strukture koje nam otežavaju uvid u područje od interesa na CT snimci. Uz pomoć sirovih podataka može se prikazati unutrašnjost lumena šupljih organa koristeći metodu virtualne endoskopije. Sve su to aplikacije koje danas olakšavaju pregled bolesnika i postavljanje dijagnoze. Međutim, za njihovo pravilno korištenje nužno je razumijevanje osnovnog principa rada kao i prednosti i nedostataka ovih tehnika. Less Abstract (english) With intensive development of modern technology and appearance of digitalisation, the possibilities of radiology in medicine are growing each day. From the development of classic CT scan as first digital radiological method to the evolution of modern multidetector or multislice helical CT scanners. Furthermore, the development of more advanced computers and data processing softwares brought enhances in image reconstruction as well as new applications of reformatting techniques for image
... More postprocessing. Although CT scanner uses traditional axial sections for imaging, with the benefits of multiplanar reformations, we can present the scanned object in other planes as well. Apart of basic anatomic planes, sagittal and coronal, using reconstructions in oblique and curved plane can also help with the diagnosing. Knowing information about radiation attenuation for each voxel and pixel, and with reformations such as MIP (Maximum Intensity Projection) or MinIP (Minimum Intensity Projection), we can obtain better display of structures with higher or lower attenuation values. Methods like VRT (Volume Rendering Technique) and SSD (Shaded Surface Display), offer three-dimensional image of object of interest. Furthemore, with segmentation process, we can choose structure we would like to analyse or we can simply exclude structures that disturb imaging the area of interest on CT scan. Having the virtual endoscopy technique, it is possible to show the internal lumen of hollow organs using raw data sets. Today, all of these applications are facilitating patients' examinations and correct diagnosis. However, the appropriate use of these aplications requires understanding the basic principles of functioning as well as their advantages and disadvantages. Less Keywords
Spiralni CT uređaj
Hounsfieldova jedinica (HU)
piksel
voksel
matriks
rekonstrukcija slike
Radonova transformacija
interpolacija
multiplanarne reformacije (MPR)
MIP tehnika
MinIP tehnika
segmentacija
prag atenuacijske vrijednosti
tehnika površinskog renderiranja
tehnika volumnog renderiranja
virtualna endoskopija
perfuzija (ključne riječi unio urednik)
Keywords (english)
Helical CT scan
Hounsfield unit (HU)
pixel
voxel
matrix
image reconstruction
Radon transform
interpolation
multiplanar reformation (MPR)
maximum intensity projection (MIP)
minimum intensity projection (MinIP)
segmentation
threshold
shaded surface display (SSD)
volume rendering technique (VRT)
virtual endoscopy technique
perfusion (ključne riječi unio urednik)
Language croatian URN:NBN urn:nbn:hr:176:352265 Study programme Title: Radiologic Technology (university/undergraduate) Type of resource Text File origin Born digital Access conditions Open access Terms of use Created on 2020-06-19 11:57:52
