Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica ›› 2006, Vol. 28 ›› Issue (1): 53-57.

• Original Articles • Previous Articles     Next Articles

Comparison of 3D Reconstructed Images between the Standard-dose
and the Low-dose Chest CT

XU Jian;SONG Wei;LI Ming-li;ZHANG Xiao-dan;JIN Zheng-yu


  1. Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China

  • Received:2005-09-26 Revised:1900-01-01 Online:2006-02-28 Published:2006-02-28
  • Contact: SONG Wei


ABSTRACT:Objective To evaluate the difference of the 3D image quality between the low-dose and the standard-dose chest CT. Methods Eleven patients were randomly scanned with the standard-dose CT and 9 with the low-dose CT. Quality of the images from both groups was evaluated by different postprocessing techniques. Results The effective tube current,total tube current,and CT dose index volume were (114.55±26.20) mAs,(1 578.27±353.09) mAs,and(7.76±1.77)mGy,respectively,in the standard-dose scanning group,and were 20 mAs,(566.11±46.23)mAs,and(1.46±0.07) mGy,respectively,in the low-dose scanning group. All these indicators had significant differences between these two groups(P<0.001). The image noises were (17.67±3.24) HU in standard-dose group and (31.61±9.42) HU in low-dose group (P<0.001). As shown by different postprocessing techniques, the median score of the standard-dose group and the low-dose group were 4.52 and 4.78,respectively,which was not significantly different (P=0.92). Conclusion The low-dose CT scanned with 20 mAs effective tube current can remarkably reduce the radiation dose,and provide satisfactory postprocessing images for diagnosis.

Key words: Key words:computed tomocrapdy, cdest, low dose, radiation dose, imace quality