Comparing axial CT slices in quantized N-dimensional SURF descriptor space to estimate the visible body region

Purpose: To describe the imaging error introduced by noncircular abdominal aortic aneurysm (AAA) necks in axial and reformatted computed tomographic (CT) images and discuss the potential implications for aortic endografting. Methods: The records of 120 endograft patients with preoperative CT axial scans and subsequent 3-dimensional (3D) computerized reconstructions were reviewed. Maximum and minimum infrarenal aortic neck diameters were measured from axial CT scans and 3D reformatted slices at the same point on the vessel. Diameter measurements were made at the largest point within the 10-mm segment of vessel below the lowest renal artery. Excluded were aneurysms with proximal neck minimum diameters >30 mm, neck lengths <15 mm, or angulation >75° measured on the axial CT slice. Results: Measuring from reformatted CT slices, 86 (71.6%) cases had ≤2-mm differences between maximal and minimal neck diameters, comprising the “round neck” group A. In 34 (28.4%) cases, the neck was not round: 26 (21.7%) had diameter differences between 2 and 4 mm (group B) and 8 (6.7%) had a >4-mm difference (group C; range 4.1–8.1 mm). Although AAA diameter, neck length, and neck angle progressively increased as the difference between neck maximum and minimum diameters grew, i.e., greater eccentricity, these trends did not reach statistical significance. Mean infrarenal neck maximum diameter was significantly larger in group C (30.2 ± 3.4 mm) compared to groups A (23.0 ± 2.9 mm, p = 0.0002) and B (23.8 ± 3.6 mm, p = 0.0003). Hence, 28.4% of AAAs had a noncircular aortic neck of varying degree, and 6.7% had an eccentricity factor that may have clinical significance. Conclusions: This study confirms the importance of selecting an endoprosthesis sized 15% to 20% larger than the infrarenal aortic neck diameter. Three-dimensional reconstruction using reformatted CT slices perpendicular to the flow lumen is an important tool that offers enhanced accuracy of infrarenal aortic neck evaluation.

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Radiologic Anatomy on Axial CT Slices in a Craniocaudal Sequence

Imaging for Otolaryngologists ◽

10.1055/b-0034-73997 ◽

2011 ◽

Keyword(s):

Radiologic Anatomy ◽

Axial Ct ◽

Ct Slices

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Automated Classification of Axial CT Slices Using Convolutional Neural Network

Innovations in Biomedical Engineering - Advances in Intelligent Systems and Computing ◽

10.1007/978-3-030-52180-6_34 ◽

2020 ◽

pp. 329-336

Author(s):

Paweł Badura ◽

Jan Juszczyk ◽

Paweł Bożek ◽

Michał Smoliński

Keyword(s):

Neural Network ◽

Convolutional Neural Network ◽

Automated Classification ◽

Axial Ct ◽

Ct Slices

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Evaluation of the Neck Structures on Axial CT slices in a Craniocaudal Sequence

Imaging for Otolaryngologists ◽

10.1055/b-0034-74007 ◽

2011 ◽

Keyword(s):

Axial Ct ◽

Ct Slices

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The accuracy of multi-slice three-dimensional computerized tomography on the verification of the pedicle screw trajectory

Orthopedic Reviews ◽

10.4081/or.2009.e22 ◽

2009 ◽

Vol 1 (1) ◽

pp. 22

Author(s):

Suat Erol Çelik ◽

Bilal Kelten ◽

Recai Gökcan ◽

Ahmet Cevri Yıldız

Keyword(s):

Pedicle Screw ◽

Computerized Tomography ◽

Spinal Surgery ◽

Three Dimensional ◽

Pedicle Screws ◽

Ct Reconstruction ◽

Axial Ct ◽

Diagnostic Power ◽

Ct Slices

The purpose of our study was to determine the diagnostic power of three-dimensional reformatted multi-slice computerized tomography (CT) images on misplaced pedicle screws in spinal surgery. Eighty-four consecutive patients with 458 screws in situ were investigated prospectively using both axial CT slices and reformatted images after operation by two blinded investigators. All the screw misplacements were documented and the differences between the two imaging modalities were recorded. Axial CT slices were able to show only 23 of 60 misplaced pedicle screws; multi-slice CT was three times more powerful in the diagnosis of pedicle screw complications in spinal surgery (p<0.05). We concluded that multi-slice CT reconstruction should be the primary diagnostic tool after screw implantation in the human spine.

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3D-CT vascular setting protocol using computer graphics for the evaluation of maxillofacial lesions

Pesquisa Odontológica Brasileira ◽

10.1590/s1517-74912001000300009 ◽

2001 ◽

Vol 15 (3) ◽

pp. 229-236 ◽

Cited By ~ 4

Author(s):

Marcelo de Gusmão Paraiso CAVALCANTI ◽

Axel RUPRECHT ◽

Michael Walter VANNIER

Keyword(s):

Computer Graphics ◽

Three Dimensional ◽

3D Ct ◽

3D Images ◽

Quantitative Analyses ◽

Axial Ct ◽

Interactive 3D ◽

Ct Slices

In this paper we present the aspect of a mandibular giant cell granuloma in spiral computed tomography-based three-dimensional (3D-CT) reconstructed images using computer graphics, and demonstrate the importance of the vascular protocol in permitting better diagnosis, visualization and determination of the dimensions of the lesion. We analyzed 21 patients with maxillofacial lesions of neoplastic and proliferative origins. Two oral and maxillofacial radiologists analyzed the images. The usefulness of interactive 3D images reconstructed by means of computer graphics, especially using a vascular setting protocol for qualitative and quantitative analyses for the diagnosis, determination of the extent of lesions, treatment planning and follow-up, was demonstrated. The technique is an important adjunct to the evaluation of lesions in relation to axial CT slices and 3D-CT bone images.

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Evaluation of the Skull Base on Axial CT Slices in a Craniocaudal Sequence

Imaging for Otolaryngologists ◽

10.1055/b-0034-73986 ◽

2011 ◽

Keyword(s):

Skull Base ◽

Axial Ct ◽

Ct Slices

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Abstract 1841: Left Atrial Volume From 3-dimensional CT Correlates With Atrial Fibrillation Recurrence Following Ablation

Circulation ◽

10.1161/circ.116.suppl_16.ii_393-c ◽

2007 ◽

Vol 116 (suppl_16) ◽

Author(s):

Adam Helms ◽

J. M Mangrum ◽

J. P Mounsey ◽

John P DiMarco ◽

Srijoy Mahapatra ◽

...

Keyword(s):

Atrial Fibrillation ◽

Left Atrial ◽

Left Atrial Volume ◽

3 Dimensional ◽

Linear Ablation ◽

Axial Ct ◽

The Mean ◽

Ct Slices ◽

Af Recurrence

Objective: Recurrence of atrial fibrillation (AF) following ablation is common, and further delineation of prognostic markers is needed. We investigated whether LA volume, which can be accurately obtained from 3-dimensional CT, correlates with AF recurrence. Methods: 73 consecutive patients (52 paroxysmal, 21 persistent) undergoing AF ablation were studied. Follow-up was for a minimum of 9 months, and success was determined by 12-lead EKG and lack of symptoms (unless symptoms proven not AF by Holter). LA volume was calculated by summation of axial CT slices. The left atrial appendage was measured separately. Results: Overall procedure success was 66% including 11 (15%) who had repeat ablations and 9 (12%) who were on antiarrhythmics. Pulmonary vein isolation was performed in all, with additional linear ablation in 44 (60%). The mean (95% CI) LA volume for those with recurrent AF was 119 cc (104, 135) versus 98 cc (90, 106) for no recurrence (p=0.01, rank sum). Wide variation in LA volume was noted in both groups (see box plot). For those patients with a volume >135cc (n=11), 9 (82%) had recurrent AF. No correlation existed between recurrence and type of AF or ablation strategy. Patients who had received a linear ablation had a larger mean LA volume than those who had not (111 cc vs. 97 cc, p=0.03, rank sum). LA appendage volume was not associated with recurrence. Conclusion: LA volume variation is large in both those with and without successful AF ablations. Mean LA volume is significantly larger in those with recurrent AF. Patients with LA volumes >135 cc are very likely to experience recurrent AF. More aggressive ablation strategies may be required in patients with large LA volumes.

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Blunt trauma of bone structures of the chest: Computed tomography vs multidetector computed tomography

Vojnosanitetski pregled ◽

10.2298/vsp1308757p ◽

2013 ◽

Vol 70 (8) ◽

pp. 757-761 ◽

Cited By ~ 1

Author(s):

Kosta Petrovic ◽

Ivan Turkalj ◽

Sanja Stojanovic ◽

Viktorija Vucaj-Cirilovic ◽

Olivera Nikolic ◽

...

Keyword(s):

Computed Tomography ◽

Blunt Trauma ◽

3D Reconstructions ◽

Thin Slice ◽

Ct Examination ◽

Significant Difference ◽

Axial Ct ◽

Bone Structures ◽

Mdct Examination ◽

Ct Slices

Background/Aim. Computerized tomography (CT), especially multidetector CT (MDCT), has had a revolutionary impact in diagnostic in traumatized patients. The aim of the study was to identify and compare the frequency of injuries to bone structures of the thorax displayed with 5-mm-thick axial CT slices and thin-slice (MDCT) examination with the use of 3D reconstructions, primarily multiplanar reformations (MPR). Methods. This prospective study included 61 patients with blunt trauma submitted to CT scan of the thorax as initial assessment. The two experienced radiologists independently and separately described the findings for 5-mmthick axial CT slices (5 mm CT) as in monoslice CT examination; MPR and other 3D reconstructions along with thin-slice axial sections which were available in modern MDCT technologies. After describing thin-slice examination in case of disagreement in the findings, the examiners redescribed thinslice examination together which was ultimately considered as a real, true finding. Results. No statistically significant difference in interobserver evaluation of 5 mm CT examination was recorded (p > 0.05). Evaluation of fractures of sternum with 5 mm CT and MDCT showed a statistically significant difference (p < 0.05) in favor of better display of injury by MDCT examination. Conclusion. MDCT is a powerful diagnostic tool that can describe higher number of bone fractures of the chest in traumatized patients compared to 5 mm CT, especially in the region of sternum for which a statistical significance was obtained using MPR. Moreover, the importance of MDCT is also set by easier and more accurate determination of the level of bone injury.

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