Detection of the spatial accuracy of a magnetic resonance and surgical computed tomography scanner in the region of surgical interest

Koivukangas, Tapani; Katisko, Jani; Koivukangas, John

doi:10.1117/1.jmi.1.1.015502

Cited by 6 publications

(8 citation statements)

References 15 publications

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“…Computed tomography (CT) scans allow the same basic methodology without needing to digitise points manually. Compared to MRI, CT images give clearer three-dimensional images of the bony landmarks, and are more spatially accurate [15]. The main drawback is that CT scans are performed in the supine position rather than upright.…”

Section: Discussionmentioning

confidence: 99%

The fascicular anatomy and peak force capabilities of the sternocleidomastoid muscle

2016

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PurposeThe fascicular morphology of the sternocleidomastoid (SCM) is not well described in modern anatomical texts, and the biomechanical forces it exerts on individual cervical motion segments are not known. The purpose of this study is to investigate the fascicular anatomy and biomechanics of the SCM combining traditional and modern methods. MethodsThis study is comprised of three parts: Dissection, magnetic resonance imaging (MRI), and biomechanical modelling. Dissection was performed on six embalmed cadavers: three males age 73-74 years; and three females age 63-93 years. The fascicular arrangement and morphologic data were recorded. MRIs were performed on six young, healthy volunteers: three males age 24-37; and three females age 26-28). In vivo volumes of the SCM were calculated using the Cavalieri method.Modelling of the SCM was performed on five sets of computed tomography (CT) scans. This mapped the fascicular arrangement of the SCM with relation to the cervical motion segments, and used volume data from the MRIs to calculate realistic peak force capabilities. ResultsDissection showed the SCM has four parts; sterno-mastoid, sterno-occipital, cleidomastoid and cleido-occipital portions. Force modelling shows that peak torque capacity of the SCM is higher at lower cervical levels, and minimal at higher levels.Peak shear forces are higher in the lower cervical spine, while compression is consistent throughout. ConclusionsThe findings provide detailed insight into the structure and function of the SCM with relation to the cervical motion segments, and will help inform models of neck muscle function and dysfunction.3

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Section: Discussionmentioning

confidence: 99%

The fascicular anatomy and peak force capabilities of the sternocleidomastoid muscle

2016

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“…This significant difference between the tracking methods means that the EMTS instrument tip is tracked closer to the sensitive anatomical structures. Also, the OTS requires stable positioning and immobilization of the patient (Koivukangas 2012). Since the EMTS patient trackers are light and may be attached to the patient without for example skull clamps, rigid immobilization of the patient during procedures is not as critical.…”

Section: Discussionmentioning

confidence: 99%

“…This study used a specially designed accuracy assessment phantom (Koivukangas 2012) to assess the accuracy of a commercial surgical navigator, the StealthStation S7 (Medtronic Inc., Louisville, CO, USA). The navigator enabled the interchangeable use of both OTS and EMTS.…”

Section: Research Equipment and Methodsmentioning

confidence: 99%

Technical accuracy of optical and the electromagnetic tracking systems

2013

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Thousands of operations are annually guided with computer assisted surgery (CAS) technologies. As the use of these devices is rapidly increasing, the reliability of the devices becomes ever more critical. The problem of accuracy assessment of the devices has thus become relevant. During the past five years, over 200 hazardous situations have been documented in the MAUDE database during operations using these devices in the field of neurosurgery alone. Had the accuracy of these devices been periodically assessed pre-operatively, many of them might have been prevented.The technical accuracy of a commercial navigator enabling the use of both optical (OTS) and electromagnetic (EMTS) tracking systems was assessed in the hospital setting using accuracy assessment tools and methods developed by the authors of this paper. The technical accuracy was obtained by comparing the positions of the navigated tool tip with the phantom accuracy assessment points. Each assessment contained a total of 51 points and a region of surgical interest (ROSI) volume of 120x120x100 mm roughly mimicking the size of the human head.The error analysis provided a comprehensive understanding of the trend of accuracy of the surgical navigator modalities. This study showed that the technical accuracies of OTS and EMTS over the pre-determined ROSI were nearly equal. However, the placement of the particular modality hardware needs to be optimized for the surgical procedure. New applications of EMTS, which does not require rigid immobilization of the surgical area, are suggested.

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“…However, the observed range of differences may warrant a larger safety factor and special circumstances may warrant additional consideration when planning the bony cut. The spatial accuracy of MRI in general has been described [4,19] and a small number of computer-navigated limbsparing resections utilizing fused CT and MRI models supplemented with intraoperative cutting templates have been studied [3,11,17,28]. In one study that quantitatively assessed margin status, it is important to consider that only nine of 26 cut planes of the pelvis were included in the margin analysis [28].…”

Section: Discussionmentioning

confidence: 99%

“…An updated assessment of the ability of MRI to accurately identify the osseous extent of tumor may allow the surgeon to better plan and consistently achieve margin-negative resections while potentially avoiding unnecessary morbidity from an overly extensive resection. Prior studies of MRI utilizing synthetic models have determined a high degree of spatial accuracy [19], and studies in mice have demonstrated that MRIs of tumor postresection were as accurate as the histopathologic assessment of the margin status in controlled study conditions [4]. However, the only known published data in humans, Sundaram et al [25] reported only qualitative evidence that MRI was the most accurate imaging modality for predicting the intramedullary extent of tumor.…”

Section: Introductionmentioning

confidence: 99%