Effects of new Titanium Cerebral Aneurysm Clips on MRI and CT Images

Kato, Yōkō; Sano, Hiroaki; Katada, K; Ogura, Yutaka; Ninomiya, Toshiko; Okuma, Isao; Kanno, Tatsuo

doi:10.1055/s-2008-1052223

Cited by 17 publications

(7 citation statements)

References 1 publication

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“…Previous reports investigating magnetic qualities of aneurysm clips indicated that aneurysm clips made from stainless steel alloy, Phynox, Elgiloy, commercially pure titanium, and titanium alloy were safe at 1.5 Tesla (1)(2)(3)5,8,(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23). However, as previously discussed, few studies have been performed to evaluate magnetic field interactions for implants in association with MR systems operating above 1.5 Tesla.…”

Section: Aneurysm Clipsmentioning

confidence: 99%

“…These factors can greatly influence the MR safety aspects of these implants. While certain aneurysm clips are a contraindication for the MR environment, others classified as nonferromagnetic or weakly ferromagnetic are deemed safe for patients or individuals exposed to MR systems operating at 1.5 Tesla or less (1)(2)(3)(4)(5)8,(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24).…”

Section: Aneurysm Clipsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic resonance safety update 2002: Implants and devices

Shellock

2002

Magnetic Resonance Imaging

250

279

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The preservation of a safe magnetic resonance (MR) environment requires constant vigilance by MR healthcare professionals, particularly with regard to the management of patients with metallic biomedical implants or devices. The variety and complexity of implants and devices constantly changes, requiring continuous attention and diligence with regard to obtaining the most current and accurate information about these objects relative to the MR environment. This review article discusses MR safety and MR compatibility issues and presents important information for a variety of implants and devices, with an emphasis on those objects that have recently undergone evaluation or that require additional consideration because of existing controversy or confusion.

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Section: Aneurysm Clipsmentioning

confidence: 99%

Section: Aneurysm Clipsmentioning

confidence: 99%

Magnetic resonance safety update 2002: Implants and devices

Shellock

2002

Magnetic Resonance Imaging

250

279

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“…Since the introduction of titanium alloy clips, the occurrence of metallic artifacts adjacent to the clip has greatly decreased, resulting in widespread usage of titanium alloy clips. Although clips made from titanium alloy permit better visualization in the clip vicinity than those made from cobalt alloy 3 , 11 , 12 , 14 , 16) , the latter still play a large clinical role due to several advantages, including high tensile strength, high closing force, and extra-large and variously fenestrated clip profiles 8) . Therefore, we wanted to determine whether there were factors other than the clip property itself influencing the cobalt clip artifacts that could be easily managed.…”

Section: Discussionmentioning

confidence: 99%

Quantitative Analysis of Factors Affecting Cobalt Alloy Clip Artifacts in Computed Tomography

Sim

Choi

2014

J Korean Neurosurg Soc

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ObjectiveClip artifacts limit the visualization of intracranial structures in CT scans from patients after aneurysmal clipping with cobalt alloy clips. This study is to analyze the parameters influencing the degree of clip artifacts.MethodsPostoperative CT scans of 60 patients with straight cobalt alloy-clipped aneurysms were analyzed for the maximal diameter of white artifacts and the angle and number of streak artifacts in axial images, and the maximal diameter of artifacts in three-dimensional (3-D) volume-rendered images. The correlation coefficient (CC) was determined between each clip artifact type and the clip blade length and clip orientation to the CT scan (angle a, lateral clip inclination in axial images; angle b, clip gradient to scan plane in lateral scout images).ResultsAngle b correlated negatively with white artifacts (r=-0.589, p<0.001) and positively with the angle (r=0.636, p<0.001) and number (r=0.505, p<0.001) of streak artifacts. Artifacts in 3-D images correlated with clip blade length (r=0.454, p=0.004). Multiple linear regression analysis revealed that angle b was the major parameter influencing white artifacts and the angle and number of streak artifacts in axial images (p<0.001), whereas clip blade length was a major factor in 3-D images (p=0.034).ConclusionUse of a clip orientation perpendicular to the scan gantry angle decreased the amount of white artifacts and allowed better visualization of the clip site.

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“…Several studies in the literature have demonstrated that titanium clips have significantly fewer artifacts on MRI and CT images (14). KATO et al (11) studied 20 patients with 26 aneurysms and demonstrated that titanium clips produce only limited artifacts and yield improved images in patients who undergo aneurysm clipping. WICHMANN et al ( 17) conducted a study on magnetic resonance characteristics of aneurysm clips made of titanium and found that the titanium aneurysm clips improved the image quality on MRI.…”

Section: Discussionmentioning

confidence: 99%