中华放射学杂志
中華放射學雜誌
중화방사학잡지
Chinese Journal of Radiology
2013年
10期
921-925
,共5页
赵红兰%马红%路欣%李秋云%陈高红%吴笑松%徐凯
趙紅蘭%馬紅%路訢%李鞦雲%陳高紅%吳笑鬆%徐凱
조홍란%마홍%로흔%리추운%진고홍%오소송%서개
乳房X线摄影术%辐射剂量%管电压
乳房X線攝影術%輻射劑量%管電壓
유방X선섭영술%복사제량%관전압
Mammography%Radiation dosage%Tube voltage
目的 探讨乳腺数字X线摄影管电压对辐射剂量和图像质量的影响.方法 (1)选择手动曝光模式,分别在钼/钼(Mo/Mo)、钼/铑(Mo/Rh)、铑/铑(Rh/Rh)3种阳极靶/滤过组合下,采用25、28和31 kVp 3种管电压以32 ～ 140 mAs范围内的14个管电流值对CIRS 015乳腺模体曝光(相当于50％的腺体和50％的脂肪、压迫厚度为4.2 cm的乳腺).记录每次曝光的皮肤入射剂量(ESE)和平均腺体剂量(AGD)；测量图像的信噪比(SNR)、对比噪声比(CNR)和品质因素(FOM),计算上述参量的平均值,比较相同靶/滤过组合不同管电压的AGD、ESE、ESE/AGD、SNR CNR和FOM均数.统计方法采用随机区组设计的方差分析.(2)选择手动曝光模式,采用Mo/Rh滤过组合和固定管电流56 mAs以23 ～ 33 kVp范围内的11个管电压值,对CIRS 015乳腺模体曝光,记录每次曝光后系统显示的AGD和ESE值,测量计算图像的SNR、CNR和FOM值,绘制AGD、ESE、ESE/AGD、SNR、CNR和FOM变化曲线.结果 Mo/Mo组合时25、28和31 kVp的AGD、ESE、SNR、CNR、FOM值分别为(1.25±0.56) mGy、(6.46±2.86) mGy、71.52 ±8.37、1.91±0.26、3.21±0.68,(1.94±0.85) mGy、(9.18 ±4.07) mGy、144.46±11.31、2.41 ±0.28、3.37±0.96和(3.01±1.38) mGy、(12.60±5.59) mGy、128.89±15.29、2.47 ±0.31、2.31±0.76; Mo/Rh组合时为(1.23±0.55) mGy、(5.26±2.33) mGy、67.31 ±4.11、1.82 ±0.19、3.01±0.82,(1.86±0.84) mGy、(7.57±3.34) mGy、139.54±12.16、2.30±0.25、3.23±0.92和(2.81±1.24) mGy、(10.48 ±4.62) mGy、127.77±15.14、2.59 ±0.31、2.67±0.68；Rh/Rh组合时为(1.09 ±0.48) mGy、(4.89±2.16) mGy、67.46±2.23、1.48±0.72、3.08±1.69,(1.75 ±0.78) mGy、(6.88 ±3.03) mGy、137.74±14.65、2.37 ±0.26、3.62±1.07和(2.59±1.13) mGy、(9.32 ±4.12) mGy、117.91±19.05、2.51 ±0.31、2.74±0.84.两种实验方法均显示:相同靶/滤过组合的AGD、ESE和CNR值随着管电压的升高而升高,ESE/AGD随着管电压的升高而下降.实验1表明28 kVp的SNR和FOM均高于25 kVp和31 kVp.实验2显示SNR和FOM曲线均呈逐渐下降趋势.统计分析表明:不同管电压的AGD、ESE、ESE/AGD、SNR、CNR和FOM值差异均存在统计学意义(F值为4.391～528.848,P值均＜0.05).其中,Mo/Mo和Rh/Rh组合时28 kVp与31 kVp的CNR值差异无统计学意义(P值均＞0.05)；3种靶/滤过组合25 kVp与28 kVp之间的FOM值差异均无统计学意义(P值均＞0.05).结论 对于压迫厚度4.2 cm,50％脂肪和50％腺体乳腺,不同管电压对辐射剂量和图像质量具有显著影响.
目的 探討乳腺數字X線攝影管電壓對輻射劑量和圖像質量的影響.方法 (1)選擇手動曝光模式,分彆在鉬/鉬(Mo/Mo)、鉬/銠(Mo/Rh)、銠/銠(Rh/Rh)3種暘極靶/濾過組閤下,採用25、28和31 kVp 3種管電壓以32 ～ 140 mAs範圍內的14箇管電流值對CIRS 015乳腺模體曝光(相噹于50％的腺體和50％的脂肪、壓迫厚度為4.2 cm的乳腺).記錄每次曝光的皮膚入射劑量(ESE)和平均腺體劑量(AGD)；測量圖像的信譟比(SNR)、對比譟聲比(CNR)和品質因素(FOM),計算上述參量的平均值,比較相同靶/濾過組閤不同管電壓的AGD、ESE、ESE/AGD、SNR CNR和FOM均數.統計方法採用隨機區組設計的方差分析.(2)選擇手動曝光模式,採用Mo/Rh濾過組閤和固定管電流56 mAs以23 ～ 33 kVp範圍內的11箇管電壓值,對CIRS 015乳腺模體曝光,記錄每次曝光後繫統顯示的AGD和ESE值,測量計算圖像的SNR、CNR和FOM值,繪製AGD、ESE、ESE/AGD、SNR、CNR和FOM變化麯線.結果 Mo/Mo組閤時25、28和31 kVp的AGD、ESE、SNR、CNR、FOM值分彆為(1.25±0.56) mGy、(6.46±2.86) mGy、71.52 ±8.37、1.91±0.26、3.21±0.68,(1.94±0.85) mGy、(9.18 ±4.07) mGy、144.46±11.31、2.41 ±0.28、3.37±0.96和(3.01±1.38) mGy、(12.60±5.59) mGy、128.89±15.29、2.47 ±0.31、2.31±0.76; Mo/Rh組閤時為(1.23±0.55) mGy、(5.26±2.33) mGy、67.31 ±4.11、1.82 ±0.19、3.01±0.82,(1.86±0.84) mGy、(7.57±3.34) mGy、139.54±12.16、2.30±0.25、3.23±0.92和(2.81±1.24) mGy、(10.48 ±4.62) mGy、127.77±15.14、2.59 ±0.31、2.67±0.68；Rh/Rh組閤時為(1.09 ±0.48) mGy、(4.89±2.16) mGy、67.46±2.23、1.48±0.72、3.08±1.69,(1.75 ±0.78) mGy、(6.88 ±3.03) mGy、137.74±14.65、2.37 ±0.26、3.62±1.07和(2.59±1.13) mGy、(9.32 ±4.12) mGy、117.91±19.05、2.51 ±0.31、2.74±0.84.兩種實驗方法均顯示:相同靶/濾過組閤的AGD、ESE和CNR值隨著管電壓的升高而升高,ESE/AGD隨著管電壓的升高而下降.實驗1錶明28 kVp的SNR和FOM均高于25 kVp和31 kVp.實驗2顯示SNR和FOM麯線均呈逐漸下降趨勢.統計分析錶明:不同管電壓的AGD、ESE、ESE/AGD、SNR、CNR和FOM值差異均存在統計學意義(F值為4.391～528.848,P值均＜0.05).其中,Mo/Mo和Rh/Rh組閤時28 kVp與31 kVp的CNR值差異無統計學意義(P值均＞0.05)；3種靶/濾過組閤25 kVp與28 kVp之間的FOM值差異均無統計學意義(P值均＞0.05).結論 對于壓迫厚度4.2 cm,50％脂肪和50％腺體乳腺,不同管電壓對輻射劑量和圖像質量具有顯著影響.
목적 탐토유선수자X선섭영관전압대복사제량화도상질량적영향.방법 (1)선택수동폭광모식,분별재목/목(Mo/Mo)、목/로(Mo/Rh)、로/로(Rh/Rh)3충양겁파/려과조합하,채용25、28화31 kVp 3충관전압이32 ～ 140 mAs범위내적14개관전류치대CIRS 015유선모체폭광(상당우50％적선체화50％적지방、압박후도위4.2 cm적유선).기록매차폭광적피부입사제량(ESE)화평균선체제량(AGD)；측량도상적신조비(SNR)、대비조성비(CNR)화품질인소(FOM),계산상술삼량적평균치,비교상동파/려과조합불동관전압적AGD、ESE、ESE/AGD、SNR CNR화FOM균수.통계방법채용수궤구조설계적방차분석.(2)선택수동폭광모식,채용Mo/Rh려과조합화고정관전류56 mAs이23 ～ 33 kVp범위내적11개관전압치,대CIRS 015유선모체폭광,기록매차폭광후계통현시적AGD화ESE치,측량계산도상적SNR、CNR화FOM치,회제AGD、ESE、ESE/AGD、SNR、CNR화FOM변화곡선.결과 Mo/Mo조합시25、28화31 kVp적AGD、ESE、SNR、CNR、FOM치분별위(1.25±0.56) mGy、(6.46±2.86) mGy、71.52 ±8.37、1.91±0.26、3.21±0.68,(1.94±0.85) mGy、(9.18 ±4.07) mGy、144.46±11.31、2.41 ±0.28、3.37±0.96화(3.01±1.38) mGy、(12.60±5.59) mGy、128.89±15.29、2.47 ±0.31、2.31±0.76; Mo/Rh조합시위(1.23±0.55) mGy、(5.26±2.33) mGy、67.31 ±4.11、1.82 ±0.19、3.01±0.82,(1.86±0.84) mGy、(7.57±3.34) mGy、139.54±12.16、2.30±0.25、3.23±0.92화(2.81±1.24) mGy、(10.48 ±4.62) mGy、127.77±15.14、2.59 ±0.31、2.67±0.68；Rh/Rh조합시위(1.09 ±0.48) mGy、(4.89±2.16) mGy、67.46±2.23、1.48±0.72、3.08±1.69,(1.75 ±0.78) mGy、(6.88 ±3.03) mGy、137.74±14.65、2.37 ±0.26、3.62±1.07화(2.59±1.13) mGy、(9.32 ±4.12) mGy、117.91±19.05、2.51 ±0.31、2.74±0.84.량충실험방법균현시:상동파/려과조합적AGD、ESE화CNR치수착관전압적승고이승고,ESE/AGD수착관전압적승고이하강.실험1표명28 kVp적SNR화FOM균고우25 kVp화31 kVp.실험2현시SNR화FOM곡선균정축점하강추세.통계분석표명:불동관전압적AGD、ESE、ESE/AGD、SNR、CNR화FOM치차이균존재통계학의의(F치위4.391～528.848,P치균＜0.05).기중,Mo/Mo화Rh/Rh조합시28 kVp여31 kVp적CNR치차이무통계학의의(P치균＞0.05)；3충파/려과조합25 kVp여28 kVp지간적FOM치차이균무통계학의의(P치균＞0.05).결론 대우압박후도4.2 cm,50％지방화50％선체유선,불동관전압대복사제량화도상질량구유현저영향.
Objective To evaluate the effect of different tube voltages on the radiation dose and image quality of a full field digital mammography system.Methods Both experiments were performed under manual exposure mode.In one experiment,the tube voltages were kept constant at 25,28 and 31 kVp,and the CIRS 015 phantom was exposed at three target/filter combinations molybdenum/molybdenum (Mo/Mo),molybdenum/rhodium (Mo/Rh),and rhodium/rhodium (Rh/Rh) and at tube current-exposure time products of 32-140mAs.The entrance skin exposure (ESE) and average glandular dose (AGD) were recorded,the signal-to-noise ratio(SNR) and contrast-to-noise ratio (CNR) and figure of merit (FOM) were measured to evaluate the influences of different tube voltages on dose and image quality at same target/filter combination.The univariate of randomized completed block-design was used for statistics.In second experiment,the phantom were exposed using Mo/Rh combination when the tube current-exposure time product was kept constant at 56 mAs,and the tube voltage varied between 23 and 33 kVp in 1-kVp increments.The ESE and AGD were recorded,the SNR,CNR and FOM were measured for plotting the curves against tube voltages.Results At Mo/Mo combination,the AGD,ESE,SNR,CNR and FOM of 25,28 and31 kVp were(1.25 ±0.56) mGy,(6.46±2.86) mGy,71.52±8.37,1.91 ±0.26,3.21 ± 0.68; (1.94 ±0.85) mGy,(9.18±4.07) mGy,144.46 ± 11.31,2.41 ±0.28,3.37 ±0.96 and (3.01 ±1.38) mGy,(12.60±5.59) mGy,128.89 ±15.29,2.47 ±0.31,2.31 ±0.76 respectively; at Mo/Rh combination were (1.23 ±0.55) mGy,(5.26 ±2.33) mGy,67.31 ±4.11,1.82 ±0.19,3.01 ± 0.82; (1.86 ±0.84) mGy,(7.57 ±3.34) mGy,139.54 ± 12.16,2.30 ±0.25,3.23 ±0.92 and (2.81 ±1.24) mGy,(10.48 ±4.62) mGy,127.77 ±15.14,2.59 ±0.31,2.67 ±0.68; and at Rh/Rh were(1.09 ±0.48) mGy,(4.89 ±2.16) mGy,67.46 ±2.23,1.48 ±0.72,3.08 ± 1.69; (1.75 ± 0.78) mGy,(6.88 ±3.03) mGy,137.74 ± 14.65,2.37 ±0.26,3.62 ± 1.07 and (2.59 ± 1.13) mGy,(9.32 ± 4.12) mGy,117.91 ± 19.05,2.51 ± 0.31,2.74 ± 0.84.Both experiments indicated that,for a given target/filter combination,the AGD,ESE and CNR increased,but the ESE/AGD decreased with the tube voltage increasing; The first experiment indicated both SNR and FOM of 28 kVp were higher than that of 25 kVp and 31 kVp; the second experiment showed both SNR and FOM decreased with tube voltages increasing.The differences of AGD、ESE、ESE/AGD、SNR、CNR and FOM among the three tube voltages were significant (F =4.391-528.848,P ＜ 0.05) ; but the difference of CNR between 28 and 31 kVp at Mo/Mo and Rh/Rh had no statistical significance (P ＞ 0.05) ; and the differences of FOM between 25 and 28 kVp at the three target/filter combinations were not statistically significant (P ＞ 0.05).Conclusion For a breast with 4.2 cm thickness and 50％ adipose 50％ glandular composition,different tube voltages have significant effects on the radiation dose and image quality.
