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Functional MRI evaluation on activation of premotor area in verb-generation task

Quan ZHANG ; Yunting ZHANG ; Huiming YI ; Wei LI ; Jing ZHANG

Chinese Journal of Medical Imaging Technology.2009;25(10):1769-1772. doi:10.3321/j.issn:1003-3289.2009.10.011

Objective To evaluate the activation of premotor area (PMA) in verb generation task, and to discuss the possible function of PMA in language expression. Methods Block-designed fMRI with verb generation task was performed on 23 subjects with GE 1.5T MR Scanner. During the test, the subjects were asked to generate a verb based on a given noun word. The white + appeared on the center of the black screen was used as control. The fMRI data were processed with SPM 2. Group analysis was performed with single sample t-test. Average mapping was obtained and overlapped onto standard MNI template. Activation of the PMA was analyzed. Results The fMRI data of eleven subjects were selected for group analysis after head motion effect was ruled out. Average mapping showed activation in the Broca's area, posterior part of the right inferior frontal gyrus, bilateral PMA and supplemental areas (SMA), left posterior parietal cortex, right thalamus, left basal ganglions, right cerebellum, and posterior part of the right temporal lobe. The area with the greatest activated intensity in the brain was the left PMA. Conclusion PMC is important in verb generation and may be responsible for voice processing, motor imagery, word extracting as well as advanced regulation of information.

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Effect of body mass and BMI on proton hepatic MRS water suppression at 3.0T MR

Li XU ; Changhong LIANG ; Yuanqiu XIAO ; Zhonglin ZHANG

Chinese Journal of Medical Imaging Technology.2010;26(4):705-708.

Objective To explore the effect of body mass and body mass index (BMI) on proton hepatic MRS water suppression at 3.0T. Methods The prospective study of hepatic proton MRS was performed with GE Signa Excite HD 3.0T system and eight-channel torso phased-array coils using PRESS sequence in 44 healthy subjects. Liver spectra were collected with TR of 1500 ms, TE of 30 ms, VOI of 2 cm×2 cm×2 cm and NSA of 64 times. Areas and heights for metabolites resonances were caulculated. Results Group with small mass has lower height ([161.2±8.5] cm vs [167.7±6.2])cm, lower BMI ([20.8±2.3] kg/m~2 vs [25.6±2.6]kg/m~2), better water suppression effect (min-max: 90-96 vs 65-94;median: 94 vs 93), smaller height (min-max: 1.41×10~4-5.76 ×10~5 vs 3.45×10~4-1.75×10~6;median: 9.00×10~4 vs 2.58×10~5) and integrated area (min-max: 4.27×10~4-2.00×10~7 vs 1.24×10~5-5.00×10~7;median: 2.64×10~5 vs 1.19×10~6)of Lip2 than larger weight group. Standardized lipid content (min-max: 0-0.11 vs 0-0.96;median: 0.01 vs 0.04) was less. Group with lower BMI had lower weight ([55.2±8.2]kg vs [71.2±7.8]kg), smaller age ([33.2±11.9]years vs [45.6±9.4]years), better water suppression effect(min-max: 90-96 vs 65-95;median: 94 vs 93) smaller of height (min-max: 1.41×10~4-5.76×10~5 vs 3.45×10~4-1.75×10~6;median: 7.37×10~4 vs 2.11×10~5) and integrated area (min-max: [4.27×10~4-2.00×10~7] vs [1.24×10~5 -5.00×10~7];median: 2.64×10~5 vs 1.19×10~6) of Lip2 than larger weight group. Standardized lipid content (min-max: 0-0.08 vs 0.01-0.96;median: 0.01 vs 0.04) was less. There was significant correlation among water suppression, weight (r=-0.478, P=0.001) and BMI (r=-0.494, P=0.001). Conclusion Lipid accumulation in the liver may be the result of increased fat portion of the body depending on mass and BMI, and hinder to achieve effective water suppression.

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~(18)F-FDG PET/CT combining chest breath-hold spiral CT in the presurgical T staging of non-small cell lung cancer

Meng LI ; Ning WU ; Rong ZHENG ; Ying LIU ; Ying LIANG ; Wenjie ZHANG ; Ping ZHAO

Chinese Journal of Medical Imaging Technology.2010;26(1):5-9.

Objective To assess the diagnostic value of ~(18)F-FDG PET/CT combining chest breath-hold spiral CT in preoperative primary tumor staging (T stage) of non-small lung cell cancer (NSCLC) before operation. Methods Ninety NSCLC patients underwent curative surgical resection after integrated ~(18)F-FDG PET/CT and chest breath-hold spiral CT examination. Two experienced radiologists blindedly staged all primary tumors in consensus by CT and PET/CT images. Surgical and histopathologic results served as the golden standard for determing the staging value of CT and PET/CT. T stage was assigned according to the seventh edition of TNM Classification of Malignant Tumors adopted by American Joint Committee on Cancer. Results According to pathological results, CT and PET/CT classified T stage accurately in 75.56% and 82.22%, respectively (P=0.03). CT and PET/CT accurately classified 3 and 6 patients respectively in 8 patients of central cancer with atelectasis, 2 and 4 metastases respectively in 5 patients at the ipsilateral lung. Conclusions Being able to describe the morphology, size and invasive region of primary tumor in NSCLC distinctly, CT is the main imaging method for T stage. ~(18)F-FDG PET/CT has unique value in differentiating center cancer with atelectasis and diagnosing pulmonary metastasis.

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3.0T MRI features of normal acetabular labrum in children

Dongmei SUN ; Shinong PAN ; Zaiming LU ; Qiyong GUO

Chinese Journal of Medical Imaging Technology.2010;26(3):532-534.

Objective To observe the 3.0T MRI features of normal acetabular labrum and variation in children. Methods MR appearances of normal acetabular labra in 53 children aged from 4 days to 14 years were reviewed retrospectively. The children were divided into four groups according to the age:group A:0-3 years; group B:4-7 years; group C:8-11 years; group D:12-14 years. All of them were examined with 3.0T MR including axial and coronal sequences. Results ①MR appearances of normal acetabular labra could be classified into 3 types:triangle, flat-shape and absent in shape. Triangle was the most common (78.29%). ②There was remarkable difference in the distribution of labra morphology among different groups and different portions of hip. Triangle was most commonly observed in group D and on the anterior portion. ③High signal intensity of normal acetabular labra in MRI was most frequently seen on the anterior site of hip. Conclusion The shape and signal intensity of normal acetabular labrum in children varies in different age groups and different portions.

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Analysis on the Detection of PTA Blood Current of the PIH Pregnant Women by Means of the Ultrasonic Wave

Weijun GENG ; Lifang CUI

Chinese Journal of Medical Imaging Technology.2001;17(5):463-464. doi:10.3321/j.issn:1003-3289.2001.05.032

ObjectiveTo provide a new method for the predictive diagnosis of PIH through the detection of the PTA blood flowing indexes of the pregnant women. MethodTo adopt the color Doppler ultrasonic wave the conduct the contrast normal pregnant women and PIH women of post-pregnancy 30 cases respectively. Results①The peak value flow rate of blood at diastolic period (short for D), the average blood flow rate (short for MN), the ratio of the peak value blood flow rate (S/D) for PIH group are higher than those for the other two groups respectively (P<0.01); ②There is no statistic difference in the changes of the PTA artery internal diameter between the three groups. ConclusionThe changes in the PTA blood flow indexes of the PIH patients provides a new method for the diagnosis of this disease, which is of some reference value. Such indexes as S, MN and S/D of the PTA are better targets for observation.

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Cortical activations for covert and overt picture naming on fMRI

Hongzan SUN ; Qiyong GUO ; Xiaoming WANG ; Bing YU ; Zaiming LU

Chinese Journal of Medical Imaging Technology.2010;26(3):444-447.

Objective To investigate cortical activation patterns for covert and overt picture naming with functional magnetic resonance imaging (fMRI). Methods fMRI data were collected on 24-27 years old volunteers during performance of covert and overt picture naming. After statistical postprocessing analysis, head movement data were compared across tasks and average neural activation maps were available for both tasks. Results Mean and maximal translations of head movement in covert picture naming were less than those in overt picture naming, but the difference has no statistical significance (P=0.23). It was shown that covert picture naming involved an orchestration of bilateral occipital gyri and cerebellums, bilateral supplementary motor area, postcentral gyri, inferior frontal gyrus and anterior cingulate cortex. Activations in overt picture naming included those in covert naming (but more intensive), bilateral precentral gyri and posterior superior temporal gyri, left anterior superior temporal gyrus, bilateral thalamus, basal ganglia, and left insula. Conclusion Covert and overt picture naming are two different tasks involving different neural processing networks and levels. They can not be taken as substitutes for each other.

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Prenatal diagnosis of fetal pulmonary hypoplasia

Lizhu CHEN ; Ailu CAI ; Bing WANG ; Zeyu YANG

Chinese Journal of Medical Imaging Technology.2009;25(7):1310-1312. doi:10.3321/j.issn:1003-3289.2009.07.054

Pulmonary hypoplasia (PH) may lead to severe respiratory distress immediately after birth,even neonatal death. The etiological factors, clinical, ultrasonic and pathologic characteristics of PH and the proposed methods for the prenatal diagnosis were reviewed in this article.

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Visualization of fetal cranial sutures and anterior fontanelle: Comparison between two- and three-dimensional ultrasound

Jian ZHANG ; Ze XIA ; Binglan XIA

Chinese Journal of Medical Imaging Technology.2010;26(1):110-112.

Objective To evaluate the feasibility of obtaining good quality ultrasound pictures of sutures and anterior fontanelle with three-dimensional and two-dimensional ultrasound. Methods Eighty fetuses at 16-35 weeks of gestation were evaluated with two-dimensional and three-dimensional ultrasound. The sagittal, coronal, lambdoidal and metopic sutures, as well as anterior fontanelle, were inspected. Results The visualization of the sagittal suture of three-dimensional ultrasound was significantly superior to that of two-dimensional ultrasound, while no significant difference in visualization of the metopic, lambdoidal, coronal sutures and anterior fontanelle was found between the two modalities. The visualization of all sutures and anterior fontanelle was significantly superior with three-dimensional ultrasonography to that of two-dimensional ultrasonography before 30 weeks of gestation, whereas no significant difference was found between the two modalities after 30 weeks of gestation. Conclusion Three-dimensional ultrasound can provide more comprehensive information of fetal cranial sutures and anterior fontanelle than two-dimensional ultrasound does. Three-dimensional ultrasound can also supply high visualization of all sutures and anterior fontanelle before 30 weeks of gestation.

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Basic principles and clinical applications of dynamic contrast-enhanced MRI in prostate cancer

Shengjian ZHANG ; Weijun PENG ; Liangping ZHOU

Chinese Journal of Medical Imaging Technology.2010;26(2):378-380.

Dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) enables non-invasive imaging characterization of tissue vascularity with small molecular weight gadolinium chelates. Depending on this technique, tissue blood perfusion, microvessel permeability and extracellular leakage space can be obtained. The basic principles of two dynamic MRI techniques (T2*W and T1W DCE-MRI) and their applications in prostate cancer of DCE-MRI including diagnosis, differential diagnosis, formulation of treatment plan, evaluation of therapeutic reaction, detection of lesion recurrent were reviewed in this article.

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Optimization and standardization of imaging parameters for 16-slice spiral CT angiography in intracranial and cervical arteries

Bin LI ; Yijun LIU ; Renwang PU ; Jinghong LIU

Chinese Journal of Medical Imaging Technology.2010;26(3):578-580.

Objective To explore the optimization and standardization of imaging parameters for 16-slice spiral CT angiography in intracranial and cervical arteries. Methods Sixty patients were randomly divided into three groups, and the automatic bolus tracking thresholds of 100, 150 and 180 HU in the descending aorta were used respectively. The CT values of artery and vein among three groups were compared. Other 40 patients were randomly divided into A and B group and underwent CTA with different slice thickness and pitch, and the difference in arterial display were compared. Results The carotid and intracranial arteries in all three groups were well displayed. No statistical difference was found in enhancement CT values of three points of common carotid artery and internal carotid artery among three groups (P>0.05), while the differences of CT values in same level vein among three groups were significant (P<0.05). There was no significant difference in the average score of display degree between group A and B. Conclusion Imaging parameters for 16-slice spiral CT angiography in intracranial and cervical arteries are recommended as follows:100 HU (threshold), 120 kV, 280 mA, 1.25 mm (thickness), 1.375:1 (pitch), 0.5 s/r and 16×0.625 mm (effective thickness).

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