Int J Comput Assist Radiol Surg - Intraoperative detection and localization of cylindrical implants in cone-beam CT image data.

Tópicos

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Resumo

RPOSE: Orthopedic fractures are often fixed using metal implants. The correct positioning of cylindrical implants such as surgical screws, rods and guide wires is highly important. Intraoperative 3D imaging is often used to ensure proper implant placement. However, 3D image interaction is time-consuming and requires experience. We developed an automatic method that simplifies and accelerates location assessment of cylindrical implants in 3D images.METHODS: Our approach is composed of three major steps. At first, cylindrical characteristics are detected by analyzing image gradients in small image regions. Next, these characteristics are grouped in a cluster analysis. The clusters represent cylindrical implants and are used to initialize a cylinder-to-image registration. Finally, the two end points are optimized regarding image contrast along the cylinder axis.RESULTS: A total of 67 images containing 420 cylindrical implants were used for testing. Different anatomical regions (calcaneus, spine) and various image sources (two mobile devices, three reconstruction methods) were investigated. Depending on the evaluation set, the detection performance was between 91.7 and 96.1?% true- positive rate with a false-positive rate between 2.0 and 3.2?%. The end point distance errors ranged from [Formula: see text] to [Formula: see text]?mm and the orientation errors from [Formula: see text] to [Formula: see text] degrees. The average computation time was less than 5?seconds.CONCLUSIONS: An automatic method was developed and tested that obviates the need for 3D image interaction during intraoperative assessment of cylindrical orthopedic implants. The required time for working with the viewing software of cone-beam CT device is drastically reduced and leads to a shorter time under anesthesia for the patient.

Resumo Limpo

rpose orthoped fractur often fix use metal implant correct posit cylindr implant surgic screw rod guid wire high import intraop d imag often use ensur proper implant placement howev d imag interact timeconsum requir experi develop automat method simplifi acceler locat assess cylindr implant d imagesmethod approach compos three major step first cylindr characterist detect analyz imag gradient small imag region next characterist group cluster analysi cluster repres cylindr implant use initi cylindertoimag registr final two end point optim regard imag contrast along cylind axisresult total imag contain cylindr implant use test differ anatom region calcaneus spine various imag sourc two mobil devic three reconstruct method investig depend evalu set detect perform true posit rate falseposit rate end point distanc error rang formula see text formula see textmm orient error formula see text formula see text degre averag comput time less secondsconclus automat method develop test obviat need d imag interact intraop assess cylindr orthoped implant requir time work view softwar conebeam ct devic drastic reduc lead shorter time anesthesia patient

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