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1、1Acute cerebral hemorrhage magnetic resonance diffusion-weighted imagingAbstract Objective To investigate the acute cerebral hemorrhage, magnetic resonance diffusion-weighted imaging (DWI) in the performance of its mechanism. Methods of clinical symptoms after 12 h, expert DWI examination 17 cases o
2、f acute cerebral hemorrhage, the patients DWI and ADC maps were observed 17 cases of acute cerebral hemorrhage on DWI nine cases showed low signal for the central, peripheral irregular high signal; 6 cases showed homogeneous high signal for the central, peripheral, see the low signal, two cases of p
3、erformance for high and low mixed signal when b = 0 base collection like the 11 cases showed low signal, of which six cases of low signal region can be seen intermingled with the high signal, six cases showed isointense signal around see irregular ring of low signal on the ADC map 15 cases showed ho
4、mogeneous low signal. conclusions combined with ADC maps and b = 0 the basis of acquisition like that DWI is able to make an accurate diagnosis of acute cerebral hemorrhage, 2Keywords magnetic resonance imaging, diffuse cerebral hemorrhage diagnosis ABSTRACT ObjectiveTo investigate the manifestation
5、s and mechanism of acute intracerebral hemorrhage on diffusion weighted MR imaging (DWI). MethodsDWI was performed for patients with acute intracerebral hemorrhage (n = 17) within 12 hours after the onset of symptoms. Both the DWI and ADC map were analysed to investigate the manifestations and the m
6、echanism of the disease. ResultsOn DWI, among the 17 patients, nine were found with low signal in the centre and irregular outer high signal, six with middle inhomogeneous high signal and surrounding low signal, and two with mixed signal. On the DWI (b = 0), obvious low signals were found in 11 pati
7、ents of whom iso or high signals were also found in the low signal area in six patients, in isointensity with surrounding irregular low signal. Fifteen patients with inhomogeneous low signal were found on ADC map. ConclusionCombined with ADC map and the DWI (b = 0), accurate diagnosis of acute intra
8、cerebral hemorrhage could be made by diffusion weighted MR imaging. 3KEY WORDS the diffusion of magnetic resonance imaging; cerebral hemorrhage, diagnosis Magnetic resonance diffusion-weighted imaging (DWI has been widely used in acute, the diagnosis of hyperacute cerebral infarction, about the esse
9、nce of acute cerebral hemorrhage DWI performance of domestic, foreign and are rarely reported 1,2. Due to acute cerebral hemorrhage, and acute brain similar clinical symptoms of infarction, treatment is completely different, and therefore very important to distinguish between the two. DWI manifestat
10、ions of acute cerebral hemorrhage, were observed, and its mechanism are discussed. An object and method 1.1 General Information This group, 17 cases of acute cerebral hemorrhage, the patients in the clinical symptoms for 12 h within magnetic resonance (MR examination, and are experts in MR imaging 1
11、5 min after CT examination confirmed 11 cases were male and 6 females, aged 46 to 69 years old, average 58.7 years old. 41.2 the MR check DWI examination the Siemens 1.5 T whole body MR imaging system (Magnetom Sonata, Syngo the MR 2000B standard head coil. Scan parameters: TR = 3 of 100 ms, TE = 96
12、 ms, slice thickness 5 mm, the interval of 1 mm, FOV = 230 mm 201 mm, matrix 128 128. DWI sequences selected three directions imaging (b = 0,1 000 s/mm2, the diffusion gradient were imposed on the level select and frequency encoding and phase encoding direction, on-line to generate the trace DWI, ma
13、p and trace ADC map can be directly measured in the ADC images regions of interest (ROI apparent diffusion coefficient (ADC. 1.3 CT examination Using the Siemens Sensation 16-slice spiral CT scanner. Scan parameters: 120 kV, 200 mA, slice thickness 10 mm, an interval of 10 mm, matrix 256 256. 2 resu
14、lts 2.1 CT manifestations of 17 cases 5of acute cerebral hemorrhage in the basal ganglia area, 10 cases in which the right side, left side of the seven cases. On CT showed a round or oval high-density, uniform density, CT value (75.1 + - 6.7Hu peripheral edema, and adjacent structures seen under pre
15、ssure to shift. 2.2 DWI, performance On DWI, 9 cases showed low signal for the central, peripheral irregular high signal, six cases manifested as central heterogeneous high signal, the surrounding of the low signal performance in the two cases of high and low mixed signals. The basis of acquisition
16、b = 0 images, 11 cases showed low signal, of which six cases of low signal area seen intermingled with the high signal, six cases showed isointense signal, surrounded in an irregular low signal ring. On the ADC map, 15 cases showed homogeneous low signal two cases the performance of 6high and low mixed signals, among which 12 cases seen in the peripheral irregular high signal, the mean ADC value within the hematoma (41.98 + -16.96 10-5
