The Application Of Multi-slice Spiral CT In Normal Orbital Related Structures

Purposeâ‘ To explore the value of post-processing techniques of multi-slice spiral CT(MSCT) in normal orbital related structures,and the advantages of standard axle bits image in showing the normal orbital related structures symmetrically.â‘¡To explore the possibility of Low-Kilovoltage CT Scanning in orbit.Material and Methodsâ‘ 207cases with the source images of no orbital trauma history were retrospectively reviewed.The show results of conventional axel bits image and standard axle bits image after MPR reconstrution were compared and statistical analysed, also using other post-processing techniques.â‘¡In addition,forty cases(eighty orbits) of no orbital trauma history were divided into tow groups randomly,each group contains twenty cases (forty orbits).One group were scanned routinely(120Kv,100mA),and the other group was scanned with Low-Kilovoltage(100Kv,100mA).The image was reconstructed into 1.5mm and 3.0mm.The layer spacing was respectively 1.0mm and 2.0mm. The CTDvol, image quality and image noise were respectively compared between different tube voltage.Resultâ‘ The standard axle bits image afer MPR reconstrution was better than conventional axel bits image in showing the orbital related structures symmetrically,and it was more advantageous to the clinical diagnosis.Combining VR,CPR,etc post-processing techniques,it can show the whole subtle orbital structures stereoscopically and intuitively. The display rate of sutura nygomaticofrontalis,the canal of temporal bone,infraorbital canal,supraorbital notch,optic canal,and crystalline lens in the standard section was significantly higher than in conventional images(P< 0.01);.There were no difference in the display rate of the sutura zygomaticosphenoidalis(P>0.05).â‘¡Comparing the conventional scanning(120Kv),the CTDvol of 100Kv is smaller,that means the radiation dosage become lower. The study showed that, there was difference between different thickness (P<0.01).The image noise of 100Kv was higher than 120Kv.Although the image noise become higher, the image of Low-Kilovoltage can show the intraorbital structures clealy,such as eye ring, eye mustle,optic nerve,crystalline lens and orbital wall. Comparing the conventional scanning,there was no difference in image quality(P>0.05).Conclusionâ‘ The post-processing techniques of multi-slice spiral CT(MSCT) has significant meanings and advantages in showing the orbital related structures. The standard axle bits after MPR reconstrution image can show the both sides orbital structures symmetrically.lt is very important for the focus'positioning and qualitative dignosis.It can reduce the doctors' reading quantity and improve the dignosis accurancy to analy the standard images. Combining VR,CPR,etc post-processing techniques,it can show the whole subtle orbital structures stereoscopically and intuitively.â‘¡Though the image noise of Low-Kilovoltage CT Scanning(100Kv) increased, there was no difference in image quality,comparing the conventional scanning.lt can meet t the requirements of clinical diagnosis,and it's an another avaliable method to reduce the radiation dosage,besides lessening the current.