1
|
Vallarino N, Pil S, Devriendt N, Or M, Vandermeulen E, Serrano G, Paepe D, Bosmans T, de Rooster H. Diagnostic value of blood variables following attenuation of congenital extrahepatic portosystemic shunt in dogs. Vet Rec 2019; 187:e48. [PMID: 31662576 DOI: 10.1136/vr.105296] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 09/06/2019] [Accepted: 10/09/2019] [Indexed: 11/04/2022]
Abstract
BACKGROUND The aims of this study were to determine if extrahepatic portosystemic shunt (EHPSS) postoperative closure could be predicted based on preoperative blood analyses and to determine the accuracy of blood variables to evaluate persistence of portosystemic shunting postoperatively (multiple acquired portosystemic shunts (MAPSS) or persistent EHPSS). METHODS Retrospectively, 62 dogs treated surgically for congenital EHPSS that underwent postoperative trans-splenic portal scintigraphy or CT angiography three to six months postoperatively were included. RESULTS None of the studied preoperative blood variables could unambiguously predict surgical outcome. Elevated postoperative fasting venous ammonia (FA) concentration always indicated surgical failure (persistent shunting or MAPSS), but normal FA did not provide any information on the postoperative shunting status. Paired serum bile acids (SBA) were not reliable enough to confirm or exclude postoperative shunting. In the presence of low normal postoperative FA levels, elevated preprandial SBA was more likely in dogs with persistent shunting (sensitivity of 0.79, specificity of 0.83), whereas postprandial SBA below reference limit was more often observed in case of surgical success (sensitivity of 0.93, specificity of 0.67). CONCLUSION Blood variables, and more specifically the combination of FA and SBA, are not a valuable alternative to advanced medical imaging to reliably assess the surgical outcome after EHPSS surgery.
Collapse
Affiliation(s)
- Nicolas Vallarino
- Small Animal Department, Universiteit Gent Faculteit Diergeneeskunde, Merelbeke, Belgium
| | - Steven Pil
- Small Animal Department, Universiteit Gent Faculteit Diergeneeskunde, Merelbeke, Belgium
| | - Nausikaa Devriendt
- Small Animal Department, Universiteit Gent Faculteit Diergeneeskunde, Merelbeke, Belgium
| | - Matan Or
- Small Animal Department, Universiteit Gent Faculteit Diergeneeskunde, Merelbeke, Belgium
| | - Eva Vandermeulen
- Department of Medical Imaging of Domestic Animals and Orthopaedics of Small Animals, Universiteit Gent Faculteit Diergeneeskunde, Merelbeke, Belgium
| | - Gonçalo Serrano
- Small Animal Department, Universiteit Gent Faculteit Diergeneeskunde, Merelbeke, Belgium
| | - Dominique Paepe
- Small Animal Department, Universiteit Gent Faculteit Diergeneeskunde, Merelbeke, Belgium
| | - Tim Bosmans
- Small Animal Department, Universiteit Gent Faculteit Diergeneeskunde, Merelbeke, Belgium
| | - Hilde de Rooster
- Small Animal Department, Universiteit Gent Faculteit Diergeneeskunde, Merelbeke, Belgium
| |
Collapse
|
2
|
Kuroda H, Toyota S, Kumagai T, Iwata T, Kobayashi M, Mori K, Taki T. Feasibility of Smart Metal Artifact Reduction Algorithm on Computed Tomography Angiography for Clipping of Recurrent Aneurysms After Coil Embolization. World Neurosurg 2019; 127:e1249-e1254. [PMID: 31026660 DOI: 10.1016/j.wneu.2019.04.133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 04/14/2019] [Accepted: 04/15/2019] [Indexed: 10/27/2022]
Abstract
BACKGROUND The number of patients with a history of clipping of recurrent aneurysms after coil embolization has increased. The aim of this article was to report the feasibility of CT angiography using a commercial metal artifact reduction algorithm (Smart Metal Artifact Reduction [MAR]) for patients who underwent clipping of recurrent aneurysms after coil embolization. METHODS Six cases of clipping of recurrent aneurysms after coil embolization were examined with CT angiography using MAR between 2015 and 2018 at a single institution. Conventional CT angiography and three-dimensional digital subtraction angiography data were compared, and depiction of the status of treated aneurysms using MAR was estimated. RESULTS Conventional CT angiography was unable to depict the status of treated aneurysms in the patients with a history of clipping of recurrent aneurysms after coil embolization because of metal artifacts. With MAR, metal artifacts were greatly reduced, and the status of treated aneurysms was able to be depicted, although depiction was inferior to three-dimensional digital subtraction angiography. CONCLUSIONS For patients with a history of clipping of recurrent aneurysms after coil embolization, CT angiography using MAR is feasible, although further development of imaging techniques is needed.
Collapse
Affiliation(s)
- Hideki Kuroda
- Department of Neurosurgery, Kansai Rosai Hospital, Hyogo, Japan
| | - Shingo Toyota
- Department of Neurosurgery, Kansai Rosai Hospital, Hyogo, Japan.
| | - Tetsuya Kumagai
- Department of Neurosurgery, Kansai Rosai Hospital, Hyogo, Japan
| | - Takamitsu Iwata
- Department of Neurosurgery, Kansai Rosai Hospital, Hyogo, Japan
| | - Maki Kobayashi
- Department of Neurosurgery, Kansai Rosai Hospital, Hyogo, Japan
| | - Kanji Mori
- Department of Neurosurgery, Kansai Rosai Hospital, Hyogo, Japan
| | - Takuyu Taki
- Department of Neurosurgery, Kansai Rosai Hospital, Hyogo, Japan
| |
Collapse
|
3
|
Sunwoo L, Park SW, Rhim JH, Kang Y, Chung YS, Son YJ, Kim SC. Metal Artifact Reduction for Orthopedic Implants: Brain CT Angiography in Patients with Intracranial Metallic Implants. J Korean Med Sci 2018; 33:e158. [PMID: 29780296 PMCID: PMC5955738 DOI: 10.3346/jkms.2018.33.e158] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Accepted: 03/26/2018] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND The purpose of this study was to qualitatively and quantitatively evaluate the effects of a metal artifact reduction for orthopedic implants (O-MAR) for brain computed tomographic angiography (CTA) in patients with aneurysm clips and coils. METHODS The study included 36 consecutive patients with 47 intracranial metallic implants (42 aneurysm clips, 5 coils) who underwent brain CTA. The computed tomographic images with and without the O-MAR were independently reviewed both quantitatively and qualitatively by two reviewers. For quantitative analysis, image noises near the metallic implants of non-O-MAR and O-MAR images were compared. For qualitative analysis, image quality improvement and the presence of new streak artifacts were assessed. RESULTS Image noise was significantly reduced near metallic implants (P < 0.01). Improvement of implant-induced streak artifacts was observed in eight objects (17.0%). However, streak artifacts were aggravated in 11 objects (23.4%), and adjacent vessel depiction was worsened in eight objects (17.0%). In addition, new O-MAR-related streak artifacts were observed in 32 objects (68.1%). New streak artifacts were more prevalent in cases with overlapping metallic implants on the same axial plane than in those without (P = 0.018). Qualitative assessment revealed that the overall image quality was not significantly improved in O-MAR images. CONCLUSION In conclusion, the use of the O-MAR in patients with metallic implants significantly reduces image noise. However, the degree of the streak artifacts and surrounding vessel depiction were not significantly improved on O-MAR images.
Collapse
Affiliation(s)
- Leonard Sunwoo
- Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Sun-Won Park
- Department of Radiology, Seoul National University College of Medicine, Seoul, Korea
- Department of Radiology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea
| | - Jung Hyo Rhim
- Department of Radiology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea
| | - Yeonah Kang
- Department of Radiology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea
| | - Young Seob Chung
- Department of Neurosurgery, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea
| | - Young-Je Son
- Department of Neurosurgery, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea
| | - Soo Chin Kim
- Department of Radiology, Seoul National University Hospital, Healthcare System Gangnam Center, Seoul, Korea
| |
Collapse
|
4
|
Wallace ML, Ellison GW, Giglio RF, Batich CD, Berry CR, Case JB, Kim SE. Gradual attenuation of a congenital extrahepatic portosystemic shunt with a self-retaining polyacrylic acid-silicone device in 6 dogs. Vet Surg 2018; 47:722-728. [DOI: 10.1111/vsu.12797] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 10/25/2017] [Accepted: 01/03/2018] [Indexed: 12/20/2022]
Affiliation(s)
- Mandy L. Wallace
- Department of Clinical Sciences, College of Veterinary Medicine; University of Florida; Gainesville Florida
| | - Gary W. Ellison
- Department of Clinical Sciences, College of Veterinary Medicine; University of Florida; Gainesville Florida
| | - Robson F. Giglio
- Department of Clinical Sciences, College of Veterinary Medicine; University of Florida; Gainesville Florida
| | - Christopher D. Batich
- Department of Materials Science and Engineering; University of Florida; Gainesville Florida
| | - Clifford R. Berry
- Department of Clinical Sciences, College of Veterinary Medicine; University of Florida; Gainesville Florida
| | - J. Brad Case
- Department of Clinical Sciences, College of Veterinary Medicine; University of Florida; Gainesville Florida
| | - Stanley E. Kim
- Department of Clinical Sciences, College of Veterinary Medicine; University of Florida; Gainesville Florida
| |
Collapse
|
5
|
Wallace ML, Ellison GW, Giglio RF, Batich CD, Berry CR, Case JB, Kim SE. Assessment of the attenuation of an intra-abdominal vein by use of a silicone–polyacrylic acid gradual venous occlusion device in dogs and cats. Am J Vet Res 2016; 77:653-7. [DOI: 10.2460/ajvr.77.6.653] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
6
|
Wallace ML, Ellison GW, Batich C, Case JB, Kim SE. In vitro development and evaluation of a polyacrylic acid-silicone device intended for gradual occlusion of portosystemic shunts in dogs and cats. Am J Vet Res 2016; 77:315-22. [PMID: 26919604 DOI: 10.2460/ajvr.77.3.315] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To develop a device intended for gradual venous occlusion over 4 to 6 weeks. SAMPLE Silicone tubing filled with various inorganic salt and polyacrylic acid (PAA) formulations and mounted within a polypropylene or polyether ether ketone (PEEK) outer ring. PROCEDURES 15 polypropylene prototype rings were initially filled with 1 of 5 formulations and placed in PBSS. In a second test, 10 polypropylene and 7 PEEK prototype rings were filled with 1 formulation and placed in PBSS. In a third test, 2 formulations were loaded into 6 PEEK rings each, placed in physiologic solution, and incubated. In all tests, ring luminal diameter, outer diameter, and luminal area were measured over 6 weeks. RESULTS In the first test, 2 formulations had the greatest changes in luminal area and diameter, and 1 of those had a greater linear swell rate than the other had. In the second test, 6 of 7 PEEK rings and 6 of 10 polypropylene rings closed to a luminal diamater < 1 mm within 6 weeks. Polypropylene rings had a greater increase in outer diameter than did PEEK rings between 4.5 and 6 weeks. In the third test, 11 of 12 PEEK rings gradually closed to a luminal diameter < 1 mm within 6 weeks. CONCLUSIONS AND CLINICAL RELEVANCE A PAA and inorganic salt formulation in a prototype silicone and polymer ring resulted in gradual occlusion over 4 to 6 weeks in vitro. Prototype PEEK rings provided more reliable closure than did polypropylene rings.
Collapse
|
7
|
Roberts DA, Balter JM, Chaudhary N, Gemmete JJ, Pandey AS. Dosimetric measurements of Onyx embolization material for stereotactic radiosurgery. Med Phys 2012; 39:6672-81. [DOI: 10.1118/1.4757918] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
8
|
Wang J, Li T, Lu H, Liang Z. Penalized weighted least-squares approach to sinogram noise reduction and image reconstruction for low-dose X-ray computed tomography. IEEE TRANSACTIONS ON MEDICAL IMAGING 2006; 25:1272-83. [PMID: 17024831 PMCID: PMC1619874 DOI: 10.1109/42.896783] [Citation(s) in RCA: 198] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Reconstructing low-dose X-ray computed tomography (CT) images is a noise problem. This work investigated a penalized weighted least-squares (PWLS) approach to address this problem in two dimensions, where the WLS considers first- and second-order noise moments and the penalty models signal spatial correlations. Three different implementations were studied for the PWLS minimization. One utilizes a Markov random field (MRF) Gibbs functional to consider spatial correlations among nearby detector bins and projection views in sinogram space and minimizes the PWLS cost function by iterative Gauss-Seidel algorithm. Another employs Karhunen-Loève (KL) transform to de-correlate data signals among nearby views and minimizes the PWLS adaptively to each KL component by analytical calculation, where the spatial correlation among nearby bins is modeled by the same Gibbs functional. The third one models the spatial correlations among image pixels in image domain also by a MRF Gibbs functional and minimizes the PWLS by iterative successive over-relaxation algorithm. In these three implementations, a quadratic functional regularization was chosen for the MRF model. Phantom experiments showed a comparable performance of these three PWLS-based methods in terms of suppressing noise-induced streak artifacts and preserving resolution in the reconstructed images. Computer simulations concurred with the phantom experiments in terms of noise-resolution tradeoff and detectability in low contrast environment. The KL-PWLS implementation may have the advantage in terms of computation for high-resolution dynamic low-dose CT imaging.
Collapse
Affiliation(s)
- Jing Wang
- Department of Radiology, State University of New York, Stony Brook, NY 11794, USA.
| | | | | | | |
Collapse
|
9
|
Oey IF, Jeyapalan K, Entwisle JJ, Waller DA. Pseudo tumors of the lung after lung volume reduction surgery. Ann Thorac Surg 2004; 77:1094-6. [PMID: 14992943 DOI: 10.1016/j.athoracsur.2003.04.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/28/2003] [Indexed: 11/16/2022]
Abstract
We describe 2 patients who underwent lung volume reduction surgery, who postoperatively had computed tomographic scans that showed symptomatic mass lesions suggestive of malignancy and an inhaled foreign body. Investigations excluded these conditions with the remaining likely diagnosis of pseudotumor secondary to buttressing material. These potential sequelae of lung volume reduction surgery should be recognized in follow-up investigations.
Collapse
Affiliation(s)
- Inger F Oey
- Department of Thoracic Surgery Leicester, Glenfield Hospital, United Kingdom.
| | | | | | | |
Collapse
|
10
|
Krog M, Magnusson A, Nyman R, Ericsson A. Implantable drug delivery systems in computed tomography and magnetic resonance imaging--a comparison between titanium and stainless steel. Ups J Med Sci 1989; 94:153-60. [PMID: 2763390 DOI: 10.3109/03009738909178560] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The effect of implantable drug delivery systems on computed tomography (CT) and magnetic resonance imaging (MRI) was investigated in a phantom and in two patients. The implantable systems of identical construction consisted either of medical grade titanium alloy or stainless steel. Images of a phantom showed artefacts of the stainless steel port in both CT and MRI. These artefacts were substantially reduced in images of the titanium port. Similar results were found in situ in two patients.
Collapse
Affiliation(s)
- M Krog
- Department of Surgery, University Hospital, Uppsala, Sweden
| | | | | | | |
Collapse
|