Application of low kilovoltage in combination with sinogram affirmed iterative reconstruction of second-generation dual source CT in pelvic scan / 实用放射学杂志

Objective To investigate the value of low kilovoltage (100 kVp)in combination with sinogram affirmed iterative re-construction (SAFIRE)of flash dual source CT in pelvic scan in comparison with routine kilovoltage (120 kVp)and filtered back projection (FBP).Methods 88 patients with suspected pelvic lesions underwent CT scan,and the range of BMI was 1 9 kg/m2

Spectral imaging technique diagnosis the metastatic lymph nodes in thyroid carcinoma, squamous cell carcinoma metastatic lymph nodes and lymphoma / 实用放射学杂志

Objective To explore the value of spectral imaging technique in dual-energy CT in differential diagnosis of the metastatic lymph nodes in thyroid carcinoma,squamous cell carcinoma metastatic lymph nodes and lymphoma in the neck.Methods In 30 patients with pathologically confirmed with a total of 79 cervical lymph nodes enlargement which were using dual energy scan .Then observed the change trend of the spectrum curve and comparison the three kinds of lymph node energy spectrum curve’s slope.Results In the 79 lymph nodes,the metastatic lymph nodes in thyroid carcinoma were twenty-three,squamous cell carcinoma metastatic lymph nodes were twenty-four and lymphoma were thirty-two.From 60 to 180 keV,with the increase of keV values,the three kinds of malignant lymph nodes of the corresponding CT value decreasing and the higher the keV value,the CT value decrease magnitude was small,and the spectrum curve was〞drop type〞.The slope spectrum curve of the metastatic lymph nodes of thyroid carcinoma in arterial phase and parenchymal phase were maximum,which were 1.23±0.41 and 0.85±0.33,respectively.The slope spectrum curve of lymphoma in arterial phase and parenchymal phase were least,whcih were 0.40±0.16 and 0.47 ±0.09.The slope spectrum curve of the squamous cell carcinoma metastatic lymph nodes in arterial phase and parenchymal phase were 0.88±0.10 and 0.62±0.28.The energy spectrum curve slope of the three kinds of malignant lymph nodes have statistical significance.Conclusion The energy spectrum curve slope of arterial phase and parenchymal phase has some significance lymph node metastasis of in thyroid carcinoma,the metastatic lymph nodes and lymphoma in the neck.