MERJENJE T2 RELAKSACIJSKEGA ČASA ZA DOLOČANJE STOPNJE POŠKODBE HRUSTANCA IN MENISKUSA PRI KOLENU.
Introduction: T2 mapping is a quantitative magnetic resonance imaging method for estimating the degrees of knee cartilage and meniscus damage. A T2 map, which presents the spatial distribution of relaxation times, is calculated from a series of T2 weighted images. Non-damaged articular cartilage and...
| Publicado en: | Bulletin: Newsletter of the Society of Radiographers of Slovenia & the Chamber of Radiographers of Slovenia Vol. 36; no. 1; pp. 19 - 24 |
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| Autores principales: | , , |
| Formato: | diagnostic images research tables/charts Journal Article |
| Publicado: |
Slovenian Society of Radiographers
2019
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| Acceso en línea: | Ver este registro en EBSCOhost |
| Sumario: | Introduction: T2 mapping is a quantitative magnetic resonance imaging method for estimating the degrees of knee cartilage and meniscus damage. A T2 map, which presents the spatial distribution of relaxation times, is calculated from a series of T2 weighted images. Non-damaged articular cartilage and meniscus have shorter T2 relaxation time than damaged tissue does. Purpose: This study aimed to define reference values of T2 relaxation time for non-damaged and damaged knee-joint cartilage and meniscus for a Philips Achieva 3.0 T TX magnetic resonance scanner. Methods: With the defining of regions of interest on various coloured parametric maps, the average T2 relaxation times were calculated. Sixty-six measurements of T2 relaxation time were made for the meniscus region and 131 measurements for the cartilage region of the knee. T2 values were measured in different regions of interest on articular cartilage and meniscus. All values were arranged in a table, and a statistical analysis was made. Results and discussion: The T2 relaxation time of nondamaged meniscus is 14.71 ms, grade II 22.25 ms and grade III 25.42 ms. The average T2 relaxation time of non-damaged articular cartilage on the patella is 37.30 ms, on damaged 56.42 ms. The T2 relaxation time of non-damaged knee-joint articular cartilage on the femur is 40.49 ms and on damaged 59.23 ms. The average T2 relaxation time of nondamaged knee-joint articular cartilage on the tibia is 23.37 ms. Statistically significant differences between the values of T2 relaxation times comparing non-damaged and damaged tissues were proven. Conclusion: Reference values can be used for discovering early damage of meniscus and articular cartilage on the mentioned magnetic resonance scanner. Uvod: T2 mapiranje je kvantitativna metoda magnetno resonančnega slikanja, s katero lahko določimo stopnjo poškodbe hrustanca in meniskusa. Iz serije pridobljenih T2 obteženih slik izračunamo kvantitativno T2 mapo, ki predstavlja prostorsko porazdelitev relaksacijskih časov. Vrednosti T2 relaksacijskega časa zdravega so v primerjavi z vrednostmi poškodovanega sklepnega hrustanca in meniskusa nižje. Namen: Določitev referenčnih vrednosti za pulzno zaporedje T2 mapiranje na področju hrustanca in meniskusa pri kolenu za magnetno resonančni tomograf Philips Achieva 3,0 T TX. Metode dela: Na parametrični mapi pulznega zaporedja T2 mapiranje smo z označevanjem področij zanimanja izvedli 66 meritev T2 relaksacijskega časa na področju meniskusa in 131 meritev T2 relaksacijskega časa na področju hrustanca. Zanimali so nas različni predeli meniskusa in hrustanca. Iz urejenih podatkov je bila izračunana statistična analiza. Rezultati in razprava: T2 relaksacijski čas zdravega meniskusa je 14,71 ms, gradusa II 22,25 ms in gradusa III 25,42 ms. Povprečen T2 relaksacijski čas zdravega hrustanca pogačice je 37,30 ms, pri poškodovanem pa se zviša na 56,42 ms. T2 relaksacijski čas zdravega hrustanca stegnenice je 40,49 ms, poškodovanega pa 59,23 ms. T2 relaksacijski čas zdravega hrustanca golenice znaša 23,37 ms. S statističnimi testi smo dokazali statistično značilno razliko med T2 relaksacijskimi časi zdravega in poškodovanega hrustanca ter meniskusa. Zaključek: Dobljene referenčne vrednosti se lahko uporabijo kot kriterij za zaznavanje prisotnosti zgodnjih poškodb meniskusa in hrustanca pri uporabljenem magnetno resonančnem tomografu. |
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