Method for 3D navigation of airways on a single C-arm using multi-sweep limited angle acquisition and frame-by-frame device reconstruction

OBJECTIVEIntraoperative 3D imaging and navigation is increasingly used for minimally invasive spine surgery. A novel, noninvasive patient tracker that is adhered as a mask on the skin for 3D navigation necessitates a larger intraoperative 3D image set for appropriate referencing. This enlarged 3D image data set can be acquired by a state-of-the-art 3D C-arm device that is equipped with a large flat-panel detector. However, the presumably associated higher radiation exposure to the patient has essentially not yet been investigated and is therefore the objective of this study.METHODSPatients were retrospectively included if a thoracolumbar 3D scan was performed intraoperatively between 2016 and 2019 using a 3D C-arm with a large 30 × 30–cm flat-panel detector (3D scan volume 4096 cm3) or a 3D C-arm with a smaller 20 × 20–cm flat-panel detector (3D scan volume 2097 cm3), and the dose area product was available for the 3D scan. Additionally, the fluoroscopy time and the number of fluoroscopic images per 3D scan, as well as the BMI of the patients, were recorded.RESULTSThe authors compared 62 intraoperative thoracolumbar 3D scans using the 3D C-arm with a large flat-panel detector and 12 3D scans using the 3D C-arm with a small flat-panel detector. Overall, the 3D C-arm with a large flat-panel detector required more fluoroscopic images per scan (mean 389.0 ± 8.4 vs 117.0 ± 4.6, p < 0.0001), leading to a significantly higher dose area product (mean 1028.6 ± 767.9 vs 457.1 ± 118.9 cGy × cm2, p = 0.0044).CONCLUSIONSThe novel, noninvasive patient tracker mask facilitates intraoperative 3D navigation while eliminating the need for an additional skin incision with detachment of the autochthonous muscles. However, the use of this patient tracker mask requires a larger intraoperative 3D image data set for accurate registration, resulting in a 2.25 times higher radiation exposure to the patient. The use of the patient tracker mask should thus be based on an individual decision, especially taking into considering the radiation exposure and extent of instrumentation.

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Limited Angle Tomography Using Volumetric Constraints.

10.21236/ada325295 ◽

1996 ◽

Author(s):

Chaitali Biswas ◽

Helen R. Na

Keyword(s):

Limited Angle

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Reconstruction of a Combined Frontal Bone and Orbital Roof Defect With Associated Meningoencephalocele Using 3D Modeling and 3D Navigation

Craniomaxillofacial Trauma & Reconstruction Open ◽

10.1177/24727512211023340 ◽

2021 ◽

Vol 6 ◽

pp. 247275122110233

Author(s):

Rory C. O’Connor ◽

Sead Abazi ◽

Jehuda Soleman ◽

Florian M. Thieringer

Keyword(s):

3D Modeling ◽

Road Traffic ◽

Treatment Algorithm ◽

Visual Disturbance ◽

High Energy ◽

Frontal Bone ◽

3D Navigation ◽

Orbital Roof ◽

Close Observation ◽

Orbital Roof Fractures

Introduction: Orbital roof fractures are uncommon and normally associated with high energy trauma in which multiple other injuries are present. Most can be managed non-operatively with close observation. However, in a small proportion the defect is such that it permits the development of a meningoencephalocele, which can cause exophthalmos, a reduction in visual acuity and pain, all of which are unlikely to improve without surgical treatment. In light of their scarcity and the potential of serious risks with surgery that includes meningitis and visual disturbance (or even loss), thorough planning is required so that the meningoencephalocele can be reduced safely and the orbital roof adequately reconstructed. Methods: We report a case of a patient with a frontal bone defect, orbital roof fracture and associated meningoencephalocele that presented years after being involved in a road traffic accident in another country, who complained of a significant headache and orbital pain. The use of 3D modeling to help plan the surgery, and intraoperative 3D navigation to help negotiate the anterior skull base are described along with the reconstruction of the frontal bone and orbital roof using titanium mesh contoured on the 3D model. Conclusions: Although conservative management of orbital roof fractures predominates; those that are symptomatic, have associated neurologic symptoms or pose a risk to the eyesight warrant a surgical approach. The methods of repair, which center around separating the intracranial and intraorbital contents, are described in the context of this patient and previous cases, and a treatment algorithm is proposed.

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Limited-angle CT Reconstruction with ℓp Regularization

Proceedings of the Third International Symposium on Image Computing and Digital Medicine - ISICDM 2019 ◽

10.1145/3364836.3364872 ◽

2019 ◽

Author(s):

Xiaojuan Deng ◽

Xuehong Liu ◽

Hongwei Li

Keyword(s):

Ct Reconstruction ◽

Limited Angle

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Guided image filtering based ℓ0 gradient minimization for limited-angle CT image reconstruction

Journal of Inverse and Ill-Posed Problems ◽

10.1515/jiip-2020-0096 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Tianyi Wang ◽

Chengxiang Wang ◽

Kequan Zhao ◽

Wei Yu ◽

Min Huang

Keyword(s):

Iteration Process ◽

Real Data ◽

Image Filtering ◽

Reconstruction Technique ◽

Ct Reconstruction ◽

Imaging Device ◽

Practical Applications ◽

Guided Image Filtering ◽

Simultaneous Algebraic Reconstruction Technique ◽

Limited Angle

Abstract Limited-angle computed tomography (CT) reconstruction problem arises in some practical applications due to restrictions in the scanning environment or CT imaging device. Some artifacts will be presented in image reconstructed by conventional analytical algorithms. Although some regularization strategies have been proposed to suppress the artifacts, such as total variation (TV) minimization, there is still distortion in some edge portions of image. Guided image filtering (GIF) has the advantage of smoothing the image as well as preserving the edge. To further improve the image quality and protect the edge of image, we propose a coupling method, that combines ℓ 0 {\ell_{0}} gradient minimization and GIF. An intermediate result obtained by ℓ 0 {\ell_{0}} gradient minimization is regarded as a guidance image of GIF, then GIF is used to filter the result reconstructed by simultaneous algebraic reconstruction technique (SART) with nonnegative constraint. It should be stressed that the guidance image is dynamically updated as the iteration process, which can transfer the edge to the filtered image. Some simulation and real data experiments are used to evaluate the proposed method. Experimental results show that our method owns some advantages in suppressing the artifacts of limited angle CT and in preserving the edge of image.

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