浙江中医药大学学报
浙江中醫藥大學學報
절강중의약대학학보
JOURNAL OF ZHEJIANG UNIVERSITY OF TRADITIONAL CHINESE MEDICINE
2014年
8期
944-947
,共4页
口腔材料%金属%陶瓷%磁共振%伪影
口腔材料%金屬%陶瓷%磁共振%偽影
구강재료%금속%도자%자공진%위영
dental material%metal%ceramics%magnetic resonance imaging%artifact
[目的]通过对5种口腔常用金属和陶瓷材料在3种场强磁共振成像设备上以T1、T2序列进行扫描、观察、比较其伪影情况,为临床提供指导。[方法]依据标准模型的左上中切牙为牙体标准,用5种金属和陶瓷材料分别制作内冠,作为本次研究的试件。分别在0.35T、1.5T和3.0T磁共振成像设备上进行扫描,得到T1和T2像。依据有关标准和测量面积来分析比较伪影情况。[结果]氧化锆在3种场强磁共振的T1、T2像中均无伪影,铸瓷、贵金属合金、镍铬合金与钴铬合金在3种场强磁共振的T1、T2像中均可产生不同程度的伪影,且伪影面积依次增大。钴铬合金和镍铬合金测定值偏高,其中钴铬合金较其他4种材料偏高(P﹤0.05),镍铬合金较贵金属合金、铸瓷高(P﹤0.05);虽然在各种场强下,同种材料T2像伪影面积较T1像减小,4种材料的均值也是T2像伪影面积较T1像减小,但无统计学意义(P>0.05)。[结论]常用口腔金属材料会引起磁共振成像伪影,1.5T磁共振重于0.35T,3.0T磁共振重于1.5T。常用口腔陶瓷材料基本无伪影或伪影不明显。
[目的]通過對5種口腔常用金屬和陶瓷材料在3種場彊磁共振成像設備上以T1、T2序列進行掃描、觀察、比較其偽影情況,為臨床提供指導。[方法]依據標準模型的左上中切牙為牙體標準,用5種金屬和陶瓷材料分彆製作內冠,作為本次研究的試件。分彆在0.35T、1.5T和3.0T磁共振成像設備上進行掃描,得到T1和T2像。依據有關標準和測量麵積來分析比較偽影情況。[結果]氧化鋯在3種場彊磁共振的T1、T2像中均無偽影,鑄瓷、貴金屬閤金、鎳鉻閤金與鈷鉻閤金在3種場彊磁共振的T1、T2像中均可產生不同程度的偽影,且偽影麵積依次增大。鈷鉻閤金和鎳鉻閤金測定值偏高,其中鈷鉻閤金較其他4種材料偏高(P﹤0.05),鎳鉻閤金較貴金屬閤金、鑄瓷高(P﹤0.05);雖然在各種場彊下,同種材料T2像偽影麵積較T1像減小,4種材料的均值也是T2像偽影麵積較T1像減小,但無統計學意義(P>0.05)。[結論]常用口腔金屬材料會引起磁共振成像偽影,1.5T磁共振重于0.35T,3.0T磁共振重于1.5T。常用口腔陶瓷材料基本無偽影或偽影不明顯。
[목적]통과대5충구강상용금속화도자재료재3충장강자공진성상설비상이T1、T2서렬진행소묘、관찰、비교기위영정황,위림상제공지도。[방법]의거표준모형적좌상중절아위아체표준,용5충금속화도자재료분별제작내관,작위본차연구적시건。분별재0.35T、1.5T화3.0T자공진성상설비상진행소묘,득도T1화T2상。의거유관표준화측량면적래분석비교위영정황。[결과]양화고재3충장강자공진적T1、T2상중균무위영,주자、귀금속합금、얼락합금여고락합금재3충장강자공진적T1、T2상중균가산생불동정도적위영,차위영면적의차증대。고락합금화얼락합금측정치편고,기중고락합금교기타4충재료편고(P﹤0.05),얼락합금교귀금속합금、주자고(P﹤0.05);수연재각충장강하,동충재료T2상위영면적교T1상감소,4충재료적균치야시T2상위영면적교T1상감소,단무통계학의의(P>0.05)。[결론]상용구강금속재료회인기자공진성상위영,1.5T자공진중우0.35T,3.0T자공진중우1.5T。상용구강도자재료기본무위영혹위영불명현。
Objective]To measure and compare the MRI artifacts caused by common metal ic dental materials and common ceramic dental materials on different field-strength magnets.[Methods] A total of 3 common metal ic dental materials and 2 common ceramic dental materials were tested with 0.35T, 1.5T and 3.0T MR imagers. The artifact areas on these 3 different field-strength magnets were measured and statistical y compared. [Results]Zirconia in three field magnetic resonance(NMR) in T1 and T2 as no artifacts, casting porcelain, metal al oy, nickel chromium al oy and CoCr-al oy in three fields magnetic resonance(NMR) in T1 and T2 as al can produce different degree of artifacts, and artifacts area increased in turn. Cobalt chromium al oy and nickel chromium al oy measurements on the high side, the cobalt chromium al oy than other four kinds of materials on the high side( P<0.05),high nickel-chromium al oy was precious metal al oy, casting porcelain( P<0.05). [Conclusions]Commonly used metal ic dental materials could cause MR artifacts and image degradation. Compared with that on 0.35T, the artifact was increased on 1.5T magnet. Compared with that on 1.5T, the artifact was increased on 3.0T magnet.