Title SWI u detekciji kalcifikata: sustavni pregled literature
Title (english) SWI IN CALCIFICATION DETECTION: SYSTEMATIC REVIEW OF LITERATURE
Author Monika Likić
Mentor Krešimir Dolić (mentor)
Committee member Sanja Lovrić Kojundžić (predsjednik povjerenstva)
Committee member Tatjana Matijaš (član povjerenstva)
Committee member Krešimir Dolić (član povjerenstva)
Granter University of Split (University Department of Health Studies) Split
Defense date and country 2020-09-02, Croatia
Scientific / art field, discipline and subdiscipline BIOMEDICINE AND HEALTHCARE Clinical Medical Sciences
Abstract Prema svojoj definiciji, SWI (Susceptibility Weighted Imaging) je MRI pulsna sekvenca koja ima djelomičnu osjetljivost na spojeve koji iskrivljuju lokalno magnetsko polje i kao takvi ga čine korisnim pri otkrivanju prisutnosti venska krvi, krvarenje, kalcija ili depozita željeza.
SWI je 3D visoko-prostorna rezolucijska sekvenca koja se generira iz gradijent-echo (GRE) pulsnih sekvenci. GRE sekvence su osjetljive na razlike u osjetljivosti tkiva jer nemaju sposobnost preusmjeravanja
... More spinova defaziranih nehomogenostima magnetskog polja.
Spojevi koji imaju paramagnetska, diamagnetska i feromagnetska svojstva međusobno djeluju s lokalnim magnetskim poljem koji ga iskrivljuje i na taj način mijenja fazu lokalnog tkiva, što rezultira gubitkom signala.
SWI slika se dobiva na način da se iskorištavaju razlike u magnetskoj osjetljivosti krvi, željeza i kalcifikata u različitim tkivima. Fazne slike su osjetljive na promjene u magnetskom polju zbog komponenti u tkivima kao što su deoksihemoglobin, hematom ili kalcifikat te se stoga mogu koristiti za diferenciranje razlika osjetljivosti između tkiva.
Najčešća primjena SWI-a je za identifikaciju mikrokrvarenja i/ili kalcifikata te prikaz venskih struktura koje se ne mogu jasno prikazati na standardnim MRI sekvencama. Komparacijom intenziteta signala u različitim sekvencama i presjecima moguće je razlikovati krvarenje od kalcifikata što nije moguće uporabom drugih sekvenci.
Iako CT predstavlja zlatni standard u otkrivanju kalcifikata, često postoje preklapanja u prikazu između kalcifikacija i krvi. S obzirom da se za diferencijaciju kalcifikata koristi atenuacijska vrijednost u leziji od 100 i više Hounsfieldovih jedinica (HU), u slučaju preklapanja kalcifikacije i krvi, atenuacijska vrijednost je <100 HU.
Kontinuirani napredak u razvoju novih i poboljšanju postojećih MR sekvenci doveo je i do razvoja SWI-a, nove tehnike za procjenu razlika u osjetljivosti tkiva, a samim time i jasne diferencijacije između mikrokrvarenja i kalcifikata što ima važnu ulogu u diferencijalnoj dijagnostici patomorfoloških promjena CNS-a. Less
Abstract (english) SWI (Susceptibility Weighted Imaging) is an MRI pulse sequence that is partially sensitive to compounds that distort the local magnetic field and as such make it useful in detecting the presence of venous blood (venules), bleeding, calcium, and iron deposits.
SWI is a 3D high-spatial resolution sequence that is generated from gradient-echo (GRE) pulse sequences. GRE sequences are sensitive to differences in tissue sensitivity because they do not have the ability to redirect spins
... More dephased by magnetic field inhomogeneities.
Compounds that have paramagnetic, diamagnetic, and ferromagnetic properties interact with a local magnetic field that distorts it and thus alters the phase of the local tissue, resulting in signal loss.
The SWI image is obtained by exploiting the differences in the magnetic sensitivity of blood, iron, and calcifications in different tissues. Phase images are sensitive to changes in the magnetic field due to components in tissues such as deoxyhemoglobin, hematoma, or calcification, and can therefore be used to differentiate sensitivity differences between tissues.
The most common application of SWI is the identification of microbleeds and / or calcifications and the display of venous structures that cannot be clearly shown on standard MRI sequences. By comparing the signal intensity in different sequences in different slices, it is possible to differentiate bleeding from calcification, which cannot be decected by other sequences.
Although CT is the gold standard in the detection of calcifications, there are often overlaps in the presentation between calcifications and blood. Since the attenuation value in the lesion is 100 and more Hounsfield units (HU) is used for calcification differentiation, in case of overlap of calcification and blood, the attenuation value is <100 HU.
Continuous progress in the development of new and improvement of existing MR sequences has led to the development of SWI, a new technique for assessing differences in tissue sensitivity, and thus clear differentiation between micro-bleeding and calcifications, which plays an important role in differential diagnosis of pathomorphological changes. Less
Keywords
SWI
kalcifikati
MR
CT
Keywords (english)
SWI
calcifications
MR
CT
Language croatian
URN:NBN urn:nbn:hr:176:803865
Study programme Title: Radiologic Technology (university/graduate) Study programme type: university Study level: graduate Academic / professional title: magistar/magistra radiološke tehnologije (magistar/magistra radiološke tehnologije)
Type of resource Text
File origin Born digital
Access conditions Open access
Terms of use
Created on 2021-02-04 10:42:42