Abstract:The purpose of this study was to define the normal anatomic structures in the canine larynx with magnetic resonance images. TI-weighted images were taken in the sagittal and transverse planes. The MR images were obtained comparing MR images to dissection planes. Magnetic resonance imaging provides excellent anatomic detail of laryngeal structures. Therefore, it is of value of diagnostic imaging of some respiratory diseases in the dog.
“…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. Observou-se nesse estudo que a epiglote apresentou hiperintensidade em T1 (Fig.1), achado que concorda com o descrito por Vázquez et al (1998) e que explica tal fato devido a epiglote ser uma estrutura cartilagínea de natureza elástica, rica em fibra colágena tipo II, com alta densidade de prótons.…”
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.…”
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.
“…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. Observou-se nesse estudo que a epiglote apresentou hiperintensidade em T1 (Fig.1), achado que concorda com o descrito por Vázquez et al (1998) e que explica tal fato devido a epiglote ser uma estrutura cartilagínea de natureza elástica, rica em fibra colágena tipo II, com alta densidade de prótons.…”
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.…”
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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