Magnetic Resonance Imaging of the Normal Eye and Orbit of the Dog and Cat

Morgan, Rhea V.; Daniel, Gregory B.; Donnell, Robert

doi:10.1111/j.1740-8261.1994.tb00196.x

Cited by 49 publications

(40 citation statements)

References 17 publications

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“…In veterinary practice, MRI in small animal is frequently used to evaluate the head (Hundson et al 1995;Kakhainen et al 1991;Kraft et al 1986;Morgan et al 1993). The use of MRI in large animal medicine is currently limited by logistical problems of acquiring MRI images; meanwhile a few MRI studies on horses' digit have been done for example, Hevesi et al (2004), Kleitoer et al (1999) and Murray et al (2004).…”

Section: Introductionmentioning

confidence: 99%

Magnetic resonance imaging of the normal bovine digit

2009

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The purpose of this study was defining the normal structures of the digits and hoof in Holstein dairy cattle using Magnetic Resonance Image (MRI). Transverse, Sagital and Dorsoplantar MRI images of three isolated cattle cadaver digits were obtained using Gyroscan T5-NT a magnet of 0.5 Tesla and T1 Weighted sequence. The MRI images were compared to corresponding frozen cross-sections and dissect specimens of the cadaver digits. Relevant anatomical structures were identified and labeled at each level. The MRI images provided anatomical detail of the digits and hoof in Holstein dairy cattle. Transversal images provided excellent depiction of anatomical structures when compared to corresponding frozen cross-sections. The information presented in this paper would serve as an initial reference to the evaluation of MRI images of the digits and hoof in Holstein dairy cattle, that can be used by radiologist, clinicians, surgeon or for research propose in bovine lameness.

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Section: Introductionmentioning

confidence: 99%

Magnetic resonance imaging of the normal bovine digit

2009

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“…Porém, concordamos com Morgan et al (1994) e Dennis (2000) que sugerem que sua utilização deva ser reservada para os casos onde a ultrassonografia e a radiologia não obtiveram sucesso na obtenção do diagnósti-co e não há suspeita de corpo estranho ferromagnético que poderia ser atraído pelo equipamento e causar maiores lesões. O estudo permitiu a visibilização de estruturas do aparelho respiratório como: cartilagem aritenóide, cartilagem tireóide, cavidade nasal, coanas, epiglote, laringe, meato nasofaríngeo, nasofaringe, orofaringe, recesso maxilar, tonsila palatina e traqueia.…”

Section: Resultsunclassified

“…Nesse estudo as sequências T1, DP e T2 se mostraram complementares no estudo da anatomia da cabeça do cão, discordando de Kraft et al (1989), Morgan et al (1994) e Vázquez et al (1998), os quais citam T1 como a sequên-cia de escolha para os estudos anatômicos.…”

Section: Resultsunclassified

“…1989, Assheuer & Sager 1997), do olho e da órbita (Morgan et al 1994), dos linfonodos da cabeça e pescoço (Kneissl & Probst, 2006), das cavidades nasais e seios paranasais (De Rycke et al 2003), e da laringe (Vázquez et al 1998), entre outros. Foram também estudados o cérebro de gatos (Hudson et al 1995) e de cavalos (Arencibia et al 2001, Chaffin et al 1997.…”

Section: Introductionunclassified

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Imagem por ressonância magnética na investigação da cabeça de cães

et al. 2010

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ABSTRACT.-Hage M.C.F.N.S., Iwasaki M., Rabbani S.R., Kamikawa L., Cervantes H.J.R., Bombonato P.P., Sterman F. Magnetic resonance imaging (MRI) is the most sensitive method of diagnostic imaging to evaluate soft tissues, specially the brain, however it is expensive. The method is based on the nuclear magnetic resonance phenomenon that occurs when atomic nucleus with magnetic proprieties in the body are submitted to a strong magnetic field, and excited with radio frequency generating a radio frequency signal captured by a receptive antenna. The signal is processed by Fourier Transform for the image formation. This study had the objective to obtain 10 complete exams of heads in cadavers of normal dogs to MRI and to make an Atlas of head structures. The images were obtained with a magnetic resonance unit Gyroscan S15/HP Philips using a magnetic field of 1,5Tesla. The cadavers were positioned with the head into a human head coil and submitted to sagittal slices used to plan transverse and dorsal slices in T1, T2 and DP spin-echo sequences. In T1 we adjusted TR=400ms and TE=30ms, in T2 TR=2000ms and TE=80ms and in DP TR=2000ms and TE=30ms. The slice thickness was 4mm, the number of averages 2, the matrix 256x256, the factor 1,0 and the field of view 14cm. The duration of the complete exam of the head was 74,5minutes. The images obtained with the described sequences and with the human head coil was of good quality. In T1 fat was hyperintense and fluid was hypointense. In T2 fat was less hyperintense and fluid was hyperintense. The cortical bone and the air were hypointense in all sequences used because of the low proton density. The DP sequence showed the best contrast between white and gray matter when compared with T2 and T1 sequences. Distinction of cerebral sulcus and gyrus was possible because T2 showed the cerebrospinal fluid. The identification of bone structures that compound the region, muscles, main venous and arterial vessels and structures of the central nervous system, besides elements of the digestory and respiratory systems and structures of the eyes among others was possible through contrast obtained with MRI. In this study the MRI acquired in T1, DP and T2 were complementary for the anatomic study of the head and been able to demonstrate the structures of the canine head with rich anatomic details. The time used to 1 Recebido em 29 de novembro de 2009. Aceito para publicação em 24 de fevereiro de 2010.

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“…MRI does provide precise, highdefinition images of the eye, orbit, and optic pathway. [10][11][12] MRI images obtained in the oblique dorsal and oblique sagittal planes allow visualization of both the globe and retrobulbar structures within the same tissue slice section. MRI appears to provide precise localization and characterization of both intraocular and extraocular lesions, including retinal detachments, chorioretinal and iridal thickening, orbital cysts, orbital and optic pathway neoplasms, and extraocular muscle disorders.…”

Section: Ocular and Orbital Imaging Techniquesmentioning

confidence: 99%

Ophthalmic Diseases and Their Management

Hoskins¹

2004

Geriatrics &Amp; Gerontology of the Dog and Cat

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Magnetic Resonance Imaging of the Normal Eye and Orbit of the Dog and Cat

Cited by 49 publications

References 17 publications

Magnetic resonance imaging of the normal bovine digit

Magnetic resonance imaging of the normal bovine digit

Imagem por ressonância magnética na investigação da cabeça de cães

Ophthalmic Diseases and Their Management

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