Magnetic resonance imaging of the shoulder using multivane technique

Uvod: MultiVane tehnika je ena izmed tehnik zmanjševanja popačenj. To je radialna tehnika slikanja, ki s pasovi vzorči podatke v sredini k-prostora. V centru k-prostora se zbirajo podatki o kontrastni ločljivosti slike ter podatki, ki so posledica premikov med zajemom. MultiVane tehnika nam omogoča, da te podatke povprečimo ter izločimo tiste, ki bi negativno vplivali na kakovost slike. Namen: Namen diplomske naloge je primerjava T2 TSE pulznega zaporedja in PG pulznega zaporedja z zasičenjem signala iz maščobe (SPAIR) z in brez uporabe MultiVane tehnike pri slikanju rame. Glavni cilj bo oceniti prisotnost popačenj zaradi fizioloških premikov na T2 TSE pulznem zaporedju in PG pulznem zaporedju z zasičenjem signala iz maščobe (SPAIR). Metode dela: Uporabili smo deskriptivno metodo za pregled strokovne literature s področja magnetne resonance ter nato izvedli študijo primera osmih zdravih prostovoljcev, ki smo jim slikali ramo z in brez uporabe MultiVane tehnike na T2 TSE sliki v koronarni ravnini ter PG SPAIR TSE sliki v transverzalni ravnini. Na koncu pa smo ocenili še prisotnost popačenj. Rezultati: V rezultatih so prikazane slike z in brez uporabe MultiVane tehnike ter njihova razporeditev v k-prostoru, statistične vrednosti pulznih zaporedij ter vrednost ujemanja ocenjevalcev. Razprava in zaključek: Spremenila se je tudi porazdelitev podatkov v k-prostoru, ker so podatki zajeti radialno. Na podlagi Wilcoxonovega testa smo ugotovili, da se nekatera pulzna zaporedja statistično razlikujejo med seboj, razen tista, pri katerih so bile že slike brez MultiVane tehnike ocenjene z oceno 5. Pri pregledu literature smo opazili, da se je čas slikanja z uporabo te tehnike pri raziskavah podaljšal, mi pa smo ugotovili, da se čas preiskave skrajša z uporabo paralelnega slikanja. Na pridobljenih slikah smo opazili, da so slike pridobljene z MultiVane tehniko diagnostično bolj uporabne, ker smo zmanjšali vpliv popačenj na sliki.Introduction: MultiVane technique is one of techniques used to suppress artifacts in magnetic resonance imaging. It is a radial technique of capturing and averaging data in the center of k-space with the use of blades. The center of K-Space is filled with data from contrast resolution and movements captured during the imaging. MultiVane techniqe averages the captured data and eliminates the outliers in the data, that could potentially disrupt the quality of the image. Purpose: The purpose of this study is a comparison between T2 TSE pulse sequence and PD TSE pulse sequence with the use of fat sat technique (SPAIR) with and without the use of MultiVane technique in imaging of the shoulder. The main goal is to evaluate the presence of artifacts caused by physiological movements in a shoulder on images captured with T2 TSE and PD TSE (SPAIR) pulse sequences with and without the use of MultiVane technique. Methods: We analyzed the scientific literature from the field of magnetic resonance with the use of descriptive method and then performed a study on 8 healthy volunteers. We imaged the shoulders with and without the MultiVane technique, with the use of T2 TSE pulse sequence in coronal plane and PD SPAIR TSE pulse sequence in transversal plane. At the end, we evaluated the presence of artifacts on images. Results: Images presented in chapter Results are the images captured with and without the use of MultiVane technique and their distribution in k-space, statistical values of pulse sequences and matching value of the assessors. Discussion and conclusion: Image distribution in k-space has changed because the data is captured radially. With the use of Wilcoxon test we established that there is a statistical difference between some of the pulse sequences. The exceptions are images made without the use of MultiVane technique which were initially graded with the highest grade (5). Studying the literature, we noticed that in the most studies, where this technique was used, the time needed to perform the imaging was increased, whereas we found out that time decreases with the use of parallel imaging. We noticed that the images captured with the use of MultiVane technque are diagnostically more useful, because we were able to suppress the impact of artifacts on an image