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Objective:To explore the application value of computed tomography (CT) plain scan and dynamic enhanced scan in the diagnosis of solitary pulmonary nodules.Methods:The clinical data of 120 patients with solitary pulmonary nodules detected by physical examination in Baoding First Central Hospital from January 2018 to December 2020 were retrospectively reviewed. All patients were confirmed by surgery and pathology, including 77 benign lesions and 43 malignant lesions; All patients underwent CT plain scan and dynamic enhanced scan before operation. The accuracy of the two examination methods in the diagnosis of benign and malignant lesions of solitary pulmonary nodules was analyzed and compared. The detection rate of CT dynamic enhanced scan imaging characteristics (vacuole sign, ground glass sign, spinous sign, lobulation sign, hair prick sign, blood vessel cluster, pleural depression) of benign and malignant lesions of solitary pulmonary nodules was compared, and the diagnostic value of CT plain scan and dynamic enhanced scan in the differential diagnosis of benign and malignant solitary pulmonary nodules was evaluated based on the results of surgical pathological diagnosis. The manifestations and characteristic curves of CT dynamic enhanced scan of solitary pulmonary nodules was analyzed.Results:The diagnostic accuracy of CT dynamic enhanced scan for solitary pulmonary nodules was 80.00% (96/120), which was higher than that of CT plain scan (63.33%) (76/120) ( P<0.05). The sensitivity, specificity, and negative predictive value of CT dynamic enhanced scan for the diagnosis of benign and malignant lesions of solitary pulmonary nodules were higher than those of CT plain scan (all P<0.05). Among the imaging characteristics of CT dynamic enhanced scans of malignant lesions, the ground glass sign, spinous process sign, lobulation sign, spiculation sign, vascular clustering and pleural indentation were detected more frequently than those of benign lesions (all P<0.05). Benign lesions usually showed homogeneous enhancement, and a few showed heterogeneous enhancement; Malignant nodules often showed uneven enhancement, and a few had even enhancement. The time density curves of dynamic enhanced CT values in the regions of interest of benign and malignant solitary pulmonary nodules were different. Conclusions:The value of dynamic enhanced CT scan in the differential diagnosis of benign and malignant lesions of solitary pulmonary nodules is higher than that of CT plain scan, and the imaging features are obvious, with higher sensitivity and specificity, which is worthy of application.
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@#AIM: To analyze the anatomical characteristics of nasolacrimal duct development in children with congenital nasolacrimal duct obstruction by nasolacrimal duct CT scan combined with three-dimensional reconstruction technology.<p>METHODS: Prospective case control study. Totally 84 children(84 eyes)with unilateral congenital nasolacrimal duct obstruction were treated in the Department of Ophthalmology of Baoding Children's Hospital from September 2018 to September 2020. The nasolacrimal duct CT scan combined with three-dimensional reconstruction was performed. The transverse diameter and anterior posterior diameter of bilateral nasolacrimal duct were measured, and the anatomical characteristics of nasolacrimal duct development were observed and analyzed. Paired <i>t</i>-test was performed on the transverse diameter and anteroposterior diameter of bilateral nasolacrimal duct.<p>RESULTS: Nasolacrimal duct CT scan combined with three-dimensional reconstruction can clearly show the anatomical characteristics of nasolacrimal duct development in children with congenital nasolacrimal duct obstruction. The transverse diameter of bony nasolacrimal duct was 4.63±0.92mm, anterior posterior diameter was 6.03±1.08mm, the transverse diameter of middle bony nasolacrimal duct was 4.02±0.88mm, anterior posterior diameter was 5.42±1.10mm, the transverse diameter of final bony nasolacrimal duct was 4.26±0.93mm, anterior posterior diameter was 5.66±1.02mm. The transverse diameter of the bony nasolacrimal duct in the initial segment of the contralateral side was 4.12±0.78mm, the anteroposterior diameter was 5.60±1.02mm, the transverse diameter of the bony nasolacrimal duct in the middle segment was 3.92±0.86mm, the anteroposterior diameter was 5.24±1.04mm, the transverse diameter of the bony nasolacrimal duct in the final segment was 4.30±0.98mm, the anteroposterior diameter was 5.52±1.04mm. The transverse diameter and anteroposterior diameter of the affected side were larger than those of the healthy side and enlarged(<i>P</i><0.01). There was no significant difference between the affected side and the healthy side(<i>P</i>>0.05).<p>CONCLUSION:The development of bony nasolacrimal duct in the affected side of congenital nasolacrimal duct obstruction is different from that in the healthy side. The initial segment of the affected side expanded obviously.
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Objective To evaluate the clinical feasibility of localization CT enhanced image replacing plain CT scan image for target delineation and dose calculation.Methods Forty cases of NPC were collected and divided into two groups with different concentrations of contrast agents.The contours of planning target volume (PTV) and organs at risk (OARs) of each case were delineated in the plain scan image,and the contours of PTV and OARs were copied to the enhanced image.Two plans based on the plain scan image and the enhanced image were designed in the planning system of Eclipse.The dose distribution and OARs and MU were compared between the groups.Results No statistical differences were found in the dosimetry of PTV,OARs and MU (P＞0.05).Conclusion The image intensifier has little effect on the dose calculation of Eclipse for NPC.In the radiotherapy for NPC,the localization CT enhanced image can be used to replace the plain CT scan image for target delineation and dose calculation.
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Objective:To recognize the diagnostic value of emergency unenhanced CT without oral contrast material in the diagnosis of infrequent abdomen injury.Methods:990 patients with abdomen symptoms underwent plain scan using 16-row spiral CT without oral contrast material;their CT pictures were noted to find adrenal gland,pancreas,and hollow viscus injure.All cases underwent laparotomy or follow-up CT visit.The initial CT results were compared with the operative and follow-up outcome.Results:In the 990 patients with abdomen symptoms,there were 12 cases of adrenal gland injuries;17 cases of pancreas injuries,and 26 cases of hollow viscus injuries.Compared with operative and follow-up outcome,there was 0 false-negative and 0 false-positive in adrenal gland injury and the sensitivity was 100%;there were 2 false-negatives and 3 false-positives in pancreas injury and the sensitivity was 83.3%;there were 6 false-negatives and 7 false-positives in hollow visceral injury and the sensitivity was 76%.Conclusion:16-slice spiral CT has high diagnostic value in acute infrequent abdomen injury,The diagonostic sensitivity is higher to adrenal gland injury,but relatively lower to hollow viscus injury.
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Objective To evaluate the image characteristics and quality of MR plain scan with breath-holding in normal lungs. Methods There were 21 normal volunteers to be examined by MR plain scan with breath-holding using T_1WI,T_2WI,PWI fast sequences. It was required to analyze the image characteristics, to measure and calculate signal to noise ratio of the lung parenchyma and the muscle of thoracic wall individually, the contrast and contrast to noise ratio between the lung and the muscle of the thoracic wall. Results On T_1WI,The signal of lung parenchyma was weak and the beating artifacts projected to the lung fields,especially in the left inner and posterior segments. On T_2WI, the lung markings could be seen more, but the noise was obvious in the background and flowing related enhancement appeared in great vessels and heart. On PWI, the signal of lung parenchyma was homogenous and more strong without the beating artifacts of heart and great vessels. According to the order mentioned above, the signal to noise ratio were 1.68?0.21; 2.74?0.26; 4.61?0.79( F =218.06, P