|
Objective: To understand the thoracic dorsal root ganglia (dorsal root ganglion, DRG) and minimally invasive treatment-related images anatomical information and comparative evaluation of commonly used imaging technique for imaging of thoracic DRG display value. Methods: The autopsy observation: normal corpse on six specimens were dissected thoracic spine and CT myelography (CT myelography, CTM) epidural pneumography, short inversion recovery fast spin echo (Short time inversion recovery fast spin echo, FSE-STIR), saturated fat fast recovery fast spin echo (Fat Saturated fast recovery fast spin echo, fs-FRFSE) T2WI, three-dimensional fast imaging steady-state acquisition (3D fast imaging employing steady-state acquisition, 3D FIESTA) of contrast observation, focusing on shape and size of the DRG, spatial orientation and position type distribution and compare different imaging techniques for thoracic DRG anatomy display value. Clinical observation in vivo: the use of 3D FIESTA sequence of 30 healthy volunteers of thoracic DRG of 3D MRI imaging, thoracic DRG in vivo observation of shape and size, spatial orientation, location, type of distribution, and the results were compared with the autopsy observations. Results: autopsy observations T1-12 DRG average volume were 163.5 ± 70.0m ~ 3,146.2 ± 66.9 m ~ 3,71.1 ± 61.4m ~ 3,53.6 ± 21.3 m ~ 3,49.5 ± 17.4 m ~ 3,58.8 ± 30.8 m ~ 3,67.1 ± 47.2 m ~ 3,63.8 ± 30.5 m ~ 3,86.4 ± 39.4 m ~ 3,165.0 ± 61.0 m ~ 3,190.0 ± 56.3m ~ 3,220.5 ± 77.9m ~ 3, P lt; 0.05; T1-12DRG coronal direction on an average angle was 73.3 ± 2.5 °, 75.2 ± 1.9 °, 82.8 ± 2.5 °, 85.3 ± 1.7 °, 87.0 ± 2.3 °, 65.4 ± 40.1 °, 49.8 ± 45.6 °, 50.8 ± 47.2 °, 4.7 ± 26.9 °, -8.3 ± 3.1 °, -18.8 ± 2.4 °, -27.0 ± 1.5 °, P lt; 0.05; axial direction on an average angle were 16.8 ± 4.8 °, 16.1 ± 4.9 °, 7.0 ± 2.7 °, 5.7 ± 1.9 °, 4.8 ± 1.3 °, 4.8 ± 1.1 °, 4.6 ± 1.3 °, 5.6 ± 2.2 °, 5.4 ± 1.9 °, 5.7 ± 2.7 °, 6.0 ± 2.9 °, 5.5 ± 1.6 °, P lt; 0.05; thoracic DRG has transforaminal appearance (60.4%, 87/144), foraminal type (36.8%, 53/144) and spinal type (2.8%, 4/144) three positions type. There are four anatomical observation DRG (2.8%, 4/144) with pathologically confirmed mutation. CTM epidural pneumography, FSE-STIR, fs-FRFSE T2WI, 3D FIESTA displayed on thoracic DRG rates were 90.3% (130/144), 53.5% (77/144), 88.2% (127/144) , 89.5% (129/144), P lt; 0.05. Clinical observation in vivo: Volunteer group T1-12 DRG average volume of the order of 136.3 ± 27.6mm ~ 3,129.3 ± 38.6mm ~ 3,81.4 ± 33.4mm ~ 3,74.1 ± 33.1 mm ~ 3,67.7 ± 22.4mm ~ 3 , 67.1 ± 33.9mm ~ 3,68.6 ± 39.7mm ~ 3,68.0 ± 39.5mm ~ 3,91.7 ± 32.1mm ~ 3,145.9 ± 25.2mm ~ 3,161.4 ± 40.0mm ~ 3,166.2 ± 43.3mm ~ 3, P lt; 0.05. Volunteer group T1-12DRG volume trend is more consistent with the specimen group; volunteer group Coronal T1-12 DRG average angle of the line direction were 75.7 ± 3.9 °, 80.1 ± 3.3 °, 84.1 ± 3.0 °, 87.9 ± 1.3 ° , 86.7 ± 2.6 °, 72.4 ± 33.8 °, 42.4 ± 46.4 °, 42.4 ± 46.4 °, 37.1 ± 47.6 °, -4.6 ± 2.5 °, -15.5 ± 2.4 °, -24.5 ± 3.2 °, -31.6 ± 4.0 °, volunteer group Coronal T1-12 DRG distribution trend toward more consistent with the specimen group; volunteer group T1-12 DRG axial direction on an average angle were 21.6 ± 3.8 °, 16.1 ± 3.6 °, 7.4 ± 2.0 °, 6.0 ± 1.4 °, 6.1 ± 1.6 °, 5.2 ± 1.5 °, 5.8 ± 1.4 °, 5.7 ± 1.9 °, 5.5 ± 1.8 °, 6.0 ± 2.4 °, 6.3 ± 2.0 °, 8.7 ± 1.5 °, volunteer groups T1-12DRG axis bit towards distribution group is more consistent with the specimen; volunteer group thoracic DRG, the foramen outlook for 60.6% (410/677), transforaminal type is 37.7% (255/677), spinal type is 1.7% (12/677), and the location of the type specimen group DRG distribution agreement. Observed in vivo imaging has seven DRG (6.9%, 7/677) variations exist. 3D FIESTA right thoracic DRG display volunteers was 94.0 (677/720). Conclusion: The size of DRG thoracic spine, spatial orientation, location type segmental differences exist in the distribution of the size, with the \trend line to the foot lateral, axial direction of the T1-2 DRG tendency ventral oblique, T3-12DRG walk the line closer to horizontal. Transforaminal thoracic DRG to shape up, mainly in the segments above T7. Thoracic DRG variety of anatomical variations may exist. 3D FIESTA imaging sequence can dissecting thoracic DRG accurate preoperative imaging evaluation.
|