Biomaterial Database

Motion and image artifacts of various intracranial aneurysm clips in a magnetic field. 1996

K Ooka, and M Shibuya, and Y Suzuki

Department of Neurosurgery, Nagoya University School of Medicine, Japan.

Deflection angles of 36 types of Sugita intracranial aneurysm clips (Elgiloy), 2 types of Yasargil clips (Phynox), a Kirschner chip (SUS316) and a silver clip were examined by suspending each in a 1.5-tesla MRI (TOSHIBA MRT-200/FXII). Image artifacts of 5 types of intracranial aneurysm clips were also studied quantitatively with respect to their ratio of artifact/actual clip size using a spin-echo sequence with T1-weighted (Time of repetition (TR) = 500 ms, Time of echo (TE) = 20 ms) and T2-weighted (TR = 2000 ms, TE = 80 ms) images. All the Sugita clips from mini type to long type showed a deflection angle of less than 1.0 degree, the Yasargil clips less than 2.0 degrees, the Kirschner chip less than 6.0 degrees, and the silver chip did not move at all. Both brands of clips are therefore suitable for intracranial applications. The artifact size was directly proportional to the clip size and weight, though the ratio of artifact/actual width tended to decrease proportionately as the actual size and weight increased. The ratio of the width seemed slightly bigger than that of the length, but the difference did not reach statistical significance. There was no significant difference in the ratio of image artifacts/clip size between T1- and T2-weighted images.

UI	MeSH Term	Description	Entries
D008279	Magnetic Resonance Imaging	Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.	Chemical Shift Imaging,MR Tomography,MRI Scans,MRI, Functional,Magnetic Resonance Image,Magnetic Resonance Imaging, Functional,Magnetization Transfer Contrast Imaging,NMR Imaging,NMR Tomography,Tomography, NMR,Tomography, Proton Spin,fMRI,Functional Magnetic Resonance Imaging,Imaging, Chemical Shift,Proton Spin Tomography,Spin Echo Imaging,Steady-State Free Precession MRI,Tomography, MR,Zeugmatography,Chemical Shift Imagings,Echo Imaging, Spin,Echo Imagings, Spin,Functional MRI,Functional MRIs,Image, Magnetic Resonance,Imaging, Magnetic Resonance,Imaging, NMR,Imaging, Spin Echo,Imagings, Chemical Shift,Imagings, Spin Echo,MRI Scan,MRIs, Functional,Magnetic Resonance Images,Resonance Image, Magnetic,Scan, MRI,Scans, MRI,Shift Imaging, Chemical,Shift Imagings, Chemical,Spin Echo Imagings,Steady State Free Precession MRI
D011183	Postoperative Complications	Pathologic processes that affect patients after a surgical procedure. They may or may not be related to the disease for which the surgery was done, and they may or may not be direct results of the surgery.	Complication, Postoperative,Complications, Postoperative,Postoperative Complication
D002532	Intracranial Aneurysm	Abnormal outpouching in the wall of intracranial blood vessels. Most common are the saccular (berry) aneurysms located at branch points in CIRCLE OF WILLIS at the base of the brain. Vessel rupture results in SUBARACHNOID HEMORRHAGE or INTRACRANIAL HEMORRHAGES. Giant aneurysms (>2.5 cm in diameter) may compress adjacent structures, including the OCULOMOTOR NERVE. (From Adams et al., Principles of Neurology, 6th ed, p841)	Aneurysm, Cerebral,Aneurysm, Intracranial,Basilar Artery Aneurysm,Berry Aneurysm,Brain Aneurysm,Cerebral Aneurysm,Giant Intracranial Aneurysm,Mycotic Aneurysm, Intracranial,Aneurysm, Anterior Cerebral Artery,Aneurysm, Anterior Communicating Artery,Aneurysm, Basilar Artery,Aneurysm, Middle Cerebral Artery,Aneurysm, Posterior Cerebral Artery,Aneurysm, Posterior Communicating Artery,Anterior Cerebral Artery Aneurysm,Anterior Communicating Artery Aneurysm,Middle Cerebral Artery Aneurysm,Posterior Cerebral Artery Aneurysm,Posterior Communicating Artery Aneurysm,Aneurysm, Berry,Aneurysm, Brain,Aneurysm, Giant Intracranial,Aneurysm, Intracranial Mycotic,Aneurysms, Basilar Artery,Aneurysms, Berry,Aneurysms, Brain,Aneurysms, Cerebral,Aneurysms, Giant Intracranial,Aneurysms, Intracranial,Aneurysms, Intracranial Mycotic,Artery Aneurysm, Basilar,Artery Aneurysms, Basilar,Basilar Artery Aneurysms,Berry Aneurysms,Brain Aneurysms,Cerebral Aneurysms,Giant Intracranial Aneurysms,Intracranial Aneurysm, Giant,Intracranial Aneurysms,Intracranial Aneurysms, Giant,Intracranial Mycotic Aneurysm,Intracranial Mycotic Aneurysms,Mycotic Aneurysms, Intracranial
D004867	Equipment Design	Methods and patterns of fabricating machines and related hardware.	Design, Equipment,Device Design,Medical Device Design,Design, Medical Device,Designs, Medical Device,Device Design, Medical,Device Designs, Medical,Medical Device Designs,Design, Device,Designs, Device,Designs, Equipment,Device Designs,Equipment Designs
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013525	Surgical Instruments	Hand-held tools or implements used by health professionals for the performance of surgical tasks.	Clamps, Surgical,Clips, Surgical,Clips, Tantalum,Forceps,Hooks, Surgical,Plugs, Surgical,Scissors, Surgical,Speculum,Surgical Clamps,Surgical Clips,Surgical Hooks,Surgical Plugs,Surgical Scissors,Surgical Valves,Trocar,Valves, Surgical,Clamp, Surgical,Clip, Surgical,Clips,Hook, Surgical,Instrument, Surgical,Plug, Surgical,Surgical Clamp,Surgical Clip,Surgical Hook,Surgical Plug,Surgical Valve,Valve, Surgical,Clip,Clip, Tantalum,Forcep,Instruments, Surgical,Speculums,Surgical Instrument,Tantalum Clip,Tantalum Clips,Trocars
D016477	Artifacts	Any visible result of a procedure which is caused by the procedure itself and not by the entity being analyzed. Common examples include histological structures introduced by tissue processing, radiographic images of structures that are not naturally present in living tissue, and products of chemical reactions that occur during analysis.	Artefacts,Artefact,Artifact
D019736	Prostheses and Implants	Artificial substitutes for body parts, and materials inserted into tissue for functional, cosmetic, or therapeutic purposes. Prostheses can be functional, as in the case of artificial arms and legs, or cosmetic, as in the case of an artificial eye. Implants, all surgically inserted or grafted into the body, tend to be used therapeutically. IMPLANTS, EXPERIMENTAL is available for those used experimentally.	Implants, Artificial,Prostheses and Implant,Prosthesis,Prosthetic Implant,Endoprostheses,Endoprosthesis,Prostheses,Prosthetic Implants,Artificial Implant,Artificial Implants,Implant and Prostheses,Implant, Artificial,Implant, Prosthetic,Implants and Prostheses,Implants, Prosthetic