The Experts below are selected from a list of 498 Experts worldwide ranked by ideXlab platform

Y A Chung - One of the best experts on this subject based on the ideXlab platform.

  • a new reference Line for the brain ct the tuberculum sellae occipital protuberance Line is parallel to the anterior posterior commissure Line
    American Journal of Neuroradiology, 2009
    Co-Authors: Y A Chung
    Abstract:

    BACKGROUND AND PURPOSE: CT and MR imaging of the brain have diverged reference Lines. Modified Talairach anterior/posterior commissure (ACPC) Line is widely accepted as the standard for clinical brain MR imaging, while Orbitomeatal Line (OML) is used for CT. This study sought to determine an appropriate reference Line for brain CT parallel to the ACPC Line. MATERIALS AND METHODS: We measured the angles between the ACPC Line and the OML, the Line connecting the tuberculum sellae and the internal occipital protuberance (TS-IOP Line), and the Line connecting the tuberculum sellae and the external occipital protuberance (TS-EOP Line) on midsagittal brain MR images of 223 patients. In addition, with the hard palate as the basis, the angles to the ACPC Line in the brain MR images and new reference Line on the brain CT images from the same patient were measured, and the difference between the 2 angles was calculated in 30 patients. In the same method, the angles to the OML in the brain CT images and the ACPC Line on the brain MR images were measured, and their difference was calculated in 30 patients. Then the 2 difference values were compared with verification of the new reference Line. RESULTS: The angles between the ACPC Line and both the TS-IOP Line (0.0° ± 4.0°) and the TS-EOP Line (0.8° ± 3.2°) were significantly smaller than the angles between the ACPC Line and the OML (–12.6° ± 4.2°; P CONCLUSIONS: TS-OP Lines are nearly parallel to the ACPC Line.

  • ORIGINAL RESEARCH A New Reference Line for the Brain CT: The Tuberculum Sellae-Occipital Protuberance Line is Parallel to the Anterior/Posterior Commissure Line
    2009
    Co-Authors: Y. I. Kim, Y A Chung, K. J. Ahn, B. S. Kim
    Abstract:

    BACKGROUND AND PURPOSE: CT and MR imaging of the brain have diverged reference Lines. Modified Talairach anterior/posterior commissure (ACPC) Line is widely accepted as the standard for clinical brain MR imaging, while Orbitomeatal Line (OML) is used for CT. This study sought to determine an appropriate reference Line for brain CT parallel to the ACPC Line. MATERIALS AND METHODS: We measured the angles between the ACPC Line and the OML, the Line connecting the tuberculum sellae and the internal occipital protuberance (TS-IOP Line), and the Line connecting the tuberculum sellae and the external occipital protuberance (TS-EOP Line) on midsagittal brain MR images of 223 patients. In addition, with the hard palate as the basis, the angles to the ACPC Line in the brain MR images and new reference Line on the brain CT images from the same patient were measured, and the difference between the 2 angles was calculated in 30 patients. In the same method, the angles to the OML in the brain CT images and the ACPC Line on the brain MR images were measured, and their difference was calculated in 30 patients. Then the 2 difference values were compared with verification of the new reference Line. RESULTS: The angles between the ACPC Line and both the TS-IOP Line (0.0° 4.0°) and the TS-EOP Line (0.8° 3.2°) were significantly smaller than the angles between the ACPC Line and the OML (–12.6° 4.2°; P .05). In actual scanned images, the angle differences between the TS-OP (TS-IOP TS-EOP) Line and the ACPC Line (0.3° 4.5°) were statistically smaller than the angles between the OML and the ACPC Line (–6.6° 3.9°; P .05). CONCLUSIONS: TS-OP Lines are nearly parallel to the ACPC Line.

Anne E. Peterdy - One of the best experts on this subject based on the ideXlab platform.

  • External reference markers for the correction of head rotation in brain single-photon emission tomography
    European Journal of Nuclear Medicine, 1995
    Co-Authors: William D. Leslie, Andrew Borys, Donna Mcdonald, Jacqueline O. Dupont, Anne E. Peterdy
    Abstract:

    Accurate reorientation of brain single-photon emission tomography (SPET) is required for quantitative procedures and for correlation with other imaging modalities. Traditionally, brain SPET has utilized reoriented slices parallel to the Orbitomeatal Line (OML). Reorientation using internal landmarks would be more convenient but has not been systematically compared with the use of external landmarks. We compared the interobserver reproducibility for defining the sagittal and coronal angular deviations using internal landmarks, a visual method based upon external reference markers, and an automated method based upon external reference markers. Internal landmarks were inaccurate for defining the OML whether this was based upon the frontal-occipital or frontal-cerebellar plane. External reference markers resulted in significantly lower interobserver differences for both sagittal and coronal reorientation. An operator-independent implementation proved to be feasible and provided an objective measure of marker coplanarity. In summary, external reference markers should be used when reproducible reorientation and ROI placement are required.

Chuan-sen Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Comparative Research of the Thin Transverse Sectional Anatomy and the Multislice Spiral CT on Pterygopalatine Fossa Multislays Spiral Tomografi ile Pterigopalatin Fossan›n ‹nce Transverse Kesitsel Anatomisinin Karfl›laflt›rmal› Araflt›r›lmas›
    2010
    Co-Authors: Cheng-chun Chen, Zhong-xiao Chen, Xin-dong Yang, Jian-wu Zheng, Fei Huang, Fan-zhen Kong, Chuan-sen Zhang
    Abstract:

    AIM: To explore a method to obtain sub-millimeter data of the thin transverse section of the pterygopalatine fossa (PPF), and to study the thin transverse sectional anatomy of the adult pterygopalatine fossa and its communicating structure for providing anatomic gist for the imaging diagnosis and minimal invasive operation when PPF diseased. MATERIAL and METHODS: Two heads of adult cadaver without macroscopic trauma (four sides of PPF) were selected to observe. Images of 0.6 mm-thick multi-planar construction (MPR) were obtained with multislice spiral CT (MSCT) based on the superior Orbitomeatal Line. Then, the specimens were sliced into 0.1 mm serial section on the transverse plane with the computerized milling machine, the figures were taken with digital camera and the sectional data were stored in the computer. Lastly, the thin transversal section of PPF was investigated and compared with multislice spiral CT images acquired by MPR technique to explore and discuss the anatomy of the thin transverse section of the internal structure of PPF. RESULTS: PPF was divided into four portions: infrapterygopalatine portion, pterygopalatine ganglionic one, suprapterygopalatine one and roof of PPF according to the structural characteristics of the transverse section of PPF. The infrapterygopalatine portion communicated laterally with the infratemporal fossa through the pterygomaxillary fissure and communicated downwards with the oral cavity via palatine greater and lesser canals. The pterygopalatine ganglion was shown clearly in the pterygopalatine ganglionic portion, and its dimensions were 3.91x1.92 mm at the best layer. In the suprapterygopalatine portion, the sphenopalatine foramen and artery were obviously shown on the medial wall, while the palatovaginal canal and artery, the pterygoid canal and artery, and the foramen rotundum and maxillary nerve were shown from the inferiomedial to laterosuperior on the posterior wall. The vomerovaginal canal and artery were located at the slightly superior portion of the medial side of the palatovaginal canal. CONCLUSION: Figures of thin transverse section and multislice spiral CT have highly consistency for the display of PPF. Both of them can correctly identify the micro-structure, the complex relationship of the connectivity and the spatial localization in the narrow space of PPF. It can provide reference gist for the imaging diagnosis and minimal invasive operation.

  • Comparative research of the thin transverse sectional anatomy and the multislice spiral CT on Pterygopalatine Fossa.
    Turkish Neurosurgery, 2009
    Co-Authors: Cheng-chun Chen, Zhong-xiao Chen, Xin-dong Yang, Jian-wu Zheng, Fei Huang, Fan-zhen Kong, Chuan-sen Zhang
    Abstract:

    AIM To explore a method to obtain sub-millimeter data of the thin transverse section of the pterygopalatine fossa (PPF), and to study the thin transverse sectional anatomy of the adult pterygopalatine fossa and its communicating structure for providing anatomic gist for the imaging diagnosis and minimal invasive operation when PPF diseased. MATERIAL AND METHODS Two heads of adult cadaver without macroscopic trauma (four sides of PPF) were selected to observe. Images of 0.6 mm-thick multi-planar construction (MPR) were obtained with multislice spiral CT (MSCT) based on the superior Orbitomeatal Line. Then, the specimens were sliced into 0.1 mm serial section on the transverse plane with the computerized milling machine, the figures were taken with digital camera and the sectional data were stored in the computer. Lastly, the thin transversal section of PPF was investigated and compared with multislice spiral CT images acquired by MPR technique to explore and discuss the anatomy of the thin transverse section of the internal structure of PPF. RESULTS PPF was divided into four portions: infrapterygopalatine portion, pterygopalatine ganglionic one, suprapterygopalatine one and roof of PPF according to the structural characteristics of the transverse section of PPF. The infrapterygopalatine portion communicated laterally with the infratemporal fossa through the pterygomaxillary fissure and communicated downwards with the oral cavity via palatine greater and lesser canals. The pterygopalatine ganglion was shown clearly in the pterygopalatine ganglionic portion, and its dimensions were 3.91x1.92 mm at the best layer. In the suprapterygopalatine portion, the sphenopalatine foramen and artery were obviously shown on the medial wall, while the palatovaginal canal and artery, the pterygoid canal and artery, and the foramen rotundum and maxillary nerve were shown from the inferiomedial to laterosuperior on the posterior wall. The vomerovaginal canal and artery were located at the slightly superior portion of the medial side of the palatovaginal canal. CONCLUSION Figures of thin transverse section and multislice spiral CT have highly consistency for the display of PPF. Both of them can correctly identify the micro-structure, the complex relationship of the connectivity and the spatial localization in the narrow space of PPF. It can provide reference gist for the imaging diagnosis and minimal invasive operation.

William D. Leslie - One of the best experts on this subject based on the ideXlab platform.

  • External reference markers for the correction of head rotation in brain single-photon emission tomography
    European Journal of Nuclear Medicine, 1995
    Co-Authors: William D. Leslie, Andrew Borys, Donna Mcdonald, Jacqueline O. Dupont, Anne E. Peterdy
    Abstract:

    Accurate reorientation of brain single-photon emission tomography (SPET) is required for quantitative procedures and for correlation with other imaging modalities. Traditionally, brain SPET has utilized reoriented slices parallel to the Orbitomeatal Line (OML). Reorientation using internal landmarks would be more convenient but has not been systematically compared with the use of external landmarks. We compared the interobserver reproducibility for defining the sagittal and coronal angular deviations using internal landmarks, a visual method based upon external reference markers, and an automated method based upon external reference markers. Internal landmarks were inaccurate for defining the OML whether this was based upon the frontal-occipital or frontal-cerebellar plane. External reference markers resulted in significantly lower interobserver differences for both sagittal and coronal reorientation. An operator-independent implementation proved to be feasible and provided an objective measure of marker coplanarity. In summary, external reference markers should be used when reproducible reorientation and ROI placement are required.

Cheng-chun Chen - One of the best experts on this subject based on the ideXlab platform.

  • Comparative Research of the Thin Transverse Sectional Anatomy and the Multislice Spiral CT on Pterygopalatine Fossa Multislays Spiral Tomografi ile Pterigopalatin Fossan›n ‹nce Transverse Kesitsel Anatomisinin Karfl›laflt›rmal› Araflt›r›lmas›
    2010
    Co-Authors: Cheng-chun Chen, Zhong-xiao Chen, Xin-dong Yang, Jian-wu Zheng, Fei Huang, Fan-zhen Kong, Chuan-sen Zhang
    Abstract:

    AIM: To explore a method to obtain sub-millimeter data of the thin transverse section of the pterygopalatine fossa (PPF), and to study the thin transverse sectional anatomy of the adult pterygopalatine fossa and its communicating structure for providing anatomic gist for the imaging diagnosis and minimal invasive operation when PPF diseased. MATERIAL and METHODS: Two heads of adult cadaver without macroscopic trauma (four sides of PPF) were selected to observe. Images of 0.6 mm-thick multi-planar construction (MPR) were obtained with multislice spiral CT (MSCT) based on the superior Orbitomeatal Line. Then, the specimens were sliced into 0.1 mm serial section on the transverse plane with the computerized milling machine, the figures were taken with digital camera and the sectional data were stored in the computer. Lastly, the thin transversal section of PPF was investigated and compared with multislice spiral CT images acquired by MPR technique to explore and discuss the anatomy of the thin transverse section of the internal structure of PPF. RESULTS: PPF was divided into four portions: infrapterygopalatine portion, pterygopalatine ganglionic one, suprapterygopalatine one and roof of PPF according to the structural characteristics of the transverse section of PPF. The infrapterygopalatine portion communicated laterally with the infratemporal fossa through the pterygomaxillary fissure and communicated downwards with the oral cavity via palatine greater and lesser canals. The pterygopalatine ganglion was shown clearly in the pterygopalatine ganglionic portion, and its dimensions were 3.91x1.92 mm at the best layer. In the suprapterygopalatine portion, the sphenopalatine foramen and artery were obviously shown on the medial wall, while the palatovaginal canal and artery, the pterygoid canal and artery, and the foramen rotundum and maxillary nerve were shown from the inferiomedial to laterosuperior on the posterior wall. The vomerovaginal canal and artery were located at the slightly superior portion of the medial side of the palatovaginal canal. CONCLUSION: Figures of thin transverse section and multislice spiral CT have highly consistency for the display of PPF. Both of them can correctly identify the micro-structure, the complex relationship of the connectivity and the spatial localization in the narrow space of PPF. It can provide reference gist for the imaging diagnosis and minimal invasive operation.

  • Comparative research of the thin transverse sectional anatomy and the multislice spiral CT on Pterygopalatine Fossa.
    Turkish Neurosurgery, 2009
    Co-Authors: Cheng-chun Chen, Zhong-xiao Chen, Xin-dong Yang, Jian-wu Zheng, Fei Huang, Fan-zhen Kong, Chuan-sen Zhang
    Abstract:

    AIM To explore a method to obtain sub-millimeter data of the thin transverse section of the pterygopalatine fossa (PPF), and to study the thin transverse sectional anatomy of the adult pterygopalatine fossa and its communicating structure for providing anatomic gist for the imaging diagnosis and minimal invasive operation when PPF diseased. MATERIAL AND METHODS Two heads of adult cadaver without macroscopic trauma (four sides of PPF) were selected to observe. Images of 0.6 mm-thick multi-planar construction (MPR) were obtained with multislice spiral CT (MSCT) based on the superior Orbitomeatal Line. Then, the specimens were sliced into 0.1 mm serial section on the transverse plane with the computerized milling machine, the figures were taken with digital camera and the sectional data were stored in the computer. Lastly, the thin transversal section of PPF was investigated and compared with multislice spiral CT images acquired by MPR technique to explore and discuss the anatomy of the thin transverse section of the internal structure of PPF. RESULTS PPF was divided into four portions: infrapterygopalatine portion, pterygopalatine ganglionic one, suprapterygopalatine one and roof of PPF according to the structural characteristics of the transverse section of PPF. The infrapterygopalatine portion communicated laterally with the infratemporal fossa through the pterygomaxillary fissure and communicated downwards with the oral cavity via palatine greater and lesser canals. The pterygopalatine ganglion was shown clearly in the pterygopalatine ganglionic portion, and its dimensions were 3.91x1.92 mm at the best layer. In the suprapterygopalatine portion, the sphenopalatine foramen and artery were obviously shown on the medial wall, while the palatovaginal canal and artery, the pterygoid canal and artery, and the foramen rotundum and maxillary nerve were shown from the inferiomedial to laterosuperior on the posterior wall. The vomerovaginal canal and artery were located at the slightly superior portion of the medial side of the palatovaginal canal. CONCLUSION Figures of thin transverse section and multislice spiral CT have highly consistency for the display of PPF. Both of them can correctly identify the micro-structure, the complex relationship of the connectivity and the spatial localization in the narrow space of PPF. It can provide reference gist for the imaging diagnosis and minimal invasive operation.