实用手外科杂志
實用手外科雜誌
실용수외과잡지
CHINESE JOURNAL OF PRACTICAL HAND SURGERY
2014年
2期
140-143
,共4页
关节%CT%低剂量%扫描方法
關節%CT%低劑量%掃描方法
관절%CT%저제량%소묘방법
Articulation%Computed tomography%Low-dose%Scanning method
目的：比较256层螺旋CT在不同剂量条件下所获得的图像质量，以评价踝、腕关节低剂量扫描对关节正常结构显示及其图像质量的影响，从而探讨256层螺旋CT踝、腕关节低剂量扫描的可行性及其临床价值。方法收集在本院就诊的成年患者106例（130个腕、踝）。常规剂量条件组120 kV/240 mAs (对照组)，低剂量条件组100 kV/100 mAs，100 kV/80 mAs，100 kV/60 mAs，80 kV/60 mAs（实验组）。对所得原始数据进行重建处理后，以同层面感兴趣区测得CT值计算标准差（SD）记为客观评分，由两位放射科专家以双盲的方式对各扫描剂量条件下所得图像进行主观评分，用统计软件对所得分数进行数据分析。结果当扫描条件为120 kV/240 mAs，100 kV/100 mAs，100 kV/80 mAs，100 kV/60 mAs，80 kV/60 mAs时，剂量长度乘积(dose length product, DLP)分别为235.74±17.34，43.94±6.33，40.88±4.17，26.48±3.41，18.19±1.72，主观评分为3.97±0.16，3.58±0.51，3.29±0.46，3.06±0.27，2.65±0.53，客观评分分别为7.76±1.68，10.18±3.97，23.03±4.17，34.88±6.27，43.83±7.17。结论当扫描条件降至100 kV/60 mAs，患者DLP降至（26.48±3.41） mGy·cm，主观评分为3.06±0.27，所得图像中优级图像比例降低，但低剂量下的横断及三维图像能够较好显示解剖关系，符合临床需要，并保护了患者。
目的：比較256層螺鏇CT在不同劑量條件下所穫得的圖像質量，以評價踝、腕關節低劑量掃描對關節正常結構顯示及其圖像質量的影響，從而探討256層螺鏇CT踝、腕關節低劑量掃描的可行性及其臨床價值。方法收集在本院就診的成年患者106例（130箇腕、踝）。常規劑量條件組120 kV/240 mAs (對照組)，低劑量條件組100 kV/100 mAs，100 kV/80 mAs，100 kV/60 mAs，80 kV/60 mAs（實驗組）。對所得原始數據進行重建處理後，以同層麵感興趣區測得CT值計算標準差（SD）記為客觀評分，由兩位放射科專傢以雙盲的方式對各掃描劑量條件下所得圖像進行主觀評分，用統計軟件對所得分數進行數據分析。結果噹掃描條件為120 kV/240 mAs，100 kV/100 mAs，100 kV/80 mAs，100 kV/60 mAs，80 kV/60 mAs時，劑量長度乘積(dose length product, DLP)分彆為235.74±17.34，43.94±6.33，40.88±4.17，26.48±3.41，18.19±1.72，主觀評分為3.97±0.16，3.58±0.51，3.29±0.46，3.06±0.27，2.65±0.53，客觀評分分彆為7.76±1.68，10.18±3.97，23.03±4.17，34.88±6.27，43.83±7.17。結論噹掃描條件降至100 kV/60 mAs，患者DLP降至（26.48±3.41） mGy·cm，主觀評分為3.06±0.27，所得圖像中優級圖像比例降低，但低劑量下的橫斷及三維圖像能夠較好顯示解剖關繫，符閤臨床需要，併保護瞭患者。
목적：비교256층라선CT재불동제량조건하소획득적도상질량，이평개과、완관절저제량소묘대관절정상결구현시급기도상질량적영향，종이탐토256층라선CT과、완관절저제량소묘적가행성급기림상개치。방법수집재본원취진적성년환자106례（130개완、과）。상규제량조건조120 kV/240 mAs (대조조)，저제량조건조100 kV/100 mAs，100 kV/80 mAs，100 kV/60 mAs，80 kV/60 mAs（실험조）。대소득원시수거진행중건처리후，이동층면감흥취구측득CT치계산표준차（SD）기위객관평분，유량위방사과전가이쌍맹적방식대각소묘제량조건하소득도상진행주관평분，용통계연건대소득분수진행수거분석。결과당소묘조건위120 kV/240 mAs，100 kV/100 mAs，100 kV/80 mAs，100 kV/60 mAs，80 kV/60 mAs시，제량장도승적(dose length product, DLP)분별위235.74±17.34，43.94±6.33，40.88±4.17，26.48±3.41，18.19±1.72，주관평분위3.97±0.16，3.58±0.51，3.29±0.46，3.06±0.27，2.65±0.53，객관평분분별위7.76±1.68，10.18±3.97，23.03±4.17，34.88±6.27，43.83±7.17。결론당소묘조건강지100 kV/60 mAs，환자DLP강지（26.48±3.41） mGy·cm，주관평분위3.06±0.27，소득도상중우급도상비례강저，단저제량하적횡단급삼유도상능구교호현시해부관계，부합림상수요，병보호료환자。
Objective To compare the image quality under different doses conditions, and to evaluate the effect of low-dose scanning of ankle articulation and wrist articulation on the representation of normal structure and on the image quality under the condition of applying 256-slices spiral CT scanning, then to explore the feasibility and clinical significance of 256-slices low-dose spiral CT scanning of temporal bone. Methods The data of 106 (130 wrist and ankle) patients who were received CT examination in our hospital were collected. Conventional dose condition was 120 kV/240 mAs (control group), low-dose condition groups were 100 kV/100 mAs, 100 kV/80 mAs, 100 kV/60 mAs and 80 kV/60 mAs (experimen-tal groups). With the reconstruction of the acquired images, the standard deviation (SD) of CT in the regions of interest at the same level was used as the objective score; by double-blind review from two experts of radiology, evaluation of images under all kinds of the scanning doses was as subjective score. The score was analyzed with statistical method. Results When scanning dose conditions were 120 kV/240 mAs, 100 kV/100 mAs, 100 kV/80 mAs, 100 kV/60 mAs, 80 kV/60 mAs, DLP was 235.74 ±17.34, 43.94 ±6.33, 40.88±4.17, 26.48±3.41, 18.19±1.72, respectively; subjective score was 3.97±0.16, 3.58±0.51, 3.29±0.46, 3.06±0.27, 2.65±0.53, respectively;objective score (noise) was 7.76±1.68, 10.18±3.97, 23.03±4.17, 34.88± 6.27, 43.83±7.17, respectively. Conclusion When scanning condition is decreased to 100 kV/60 mAs, the dose of patient decreased from (235.74±17.34) mGy·cm to (26.48±3.41) mGy·cm, subjective score was 3.06 ±0.27, the CT 3D image quality tended to be in sound level, the portion of superior quality image decreased, but with low dose volume, the axial images and 3D images could represent the anatomical relation better, which could meet the clinical demand and protect the patient.
