Comparative scatter and dose performance of slot-scan and full-field digital chest radiography systems

被引:34
作者
Samei, E [1 ]
Lo, JY
Yoshizumi, TT
Jesneck, JL
Dobbins, JT
Floyd, CE
McAdams, HP
Ravin, CE
机构
[1] Duke Univ, Med Ctr, Duke Adv Imaging Labs, Dept Radiol, 3302, Durham, NC 27705 USA
[2] Duke Univ, Med Ctr, Dept Biomed Engn, Durham, NC 27705 USA
[3] Duke Univ, Med Ctr, Dept Phys, Durham, NC 27705 USA
[4] Duke Univ, Med Ctr, Radiat Safety Div, Durham, NC 27705 USA
关键词
D O I
10.1148/radiol.2353040516
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 [临床医学]; 100207 [影像医学与核医学]; 1009 [特种医学];
摘要
PURPOSE: To evaluate the scatter, dose, and effective detective quantum efficiency (DQE) performance of a slot-scan digital chest radiography system compared with that of a full-field digital radiography system. MATERIALS AND METHODS: Scatter fraction of a slot-scan system was measured for an anthropomorphic and a geometric phantom by using a posterior beam-stop technique at 117 and 140 kVp. Measurements were repeated with a full-field digital radiography system with and without a 13:1 antiscatter grid at 120 and 140 kVp. For both systems, the effective dose was measured on posteroanterior and lateral views for standard clinical techniques by using dosimeters embedded in a female phantom. The effective DQEs of the two systems were assessed by taking into account the scatter performance and the DQE of each system. The statistical significance of all the comparative differences was ascertained by means of t test analysis. RESULTS: The slot-scan system and the full-field system with grid yielded scatter fractions of 0.13-0.14 and 0.42-0.48 in the lungs and 0.30-0.43 and 0.69-0.78 in the mediastinum, respectively. The sum of the effective doses for posteroanterior and lateral views for the slot-scan system (0.057 mSv +/- 0.003 [ +/- standard deviation]) was 34% lower than that for the full-field system (0.086 mSv +/- 0.001, P <.05) at their respective clinical peak voltages (140 and 120 kVp, respectively). The effective DQE of the slot-scan system was equivalent to that of the full-field system in the lung region but was 37% higher in the dense regions (P <.05). CONCLUSION: The slot-scan design leads to marked scatter reduction compared with the more conventional full-field geometries with a grid. The improved scatter performance of a slot-scan geometry can effectively compensate for low DQE and lead to improved image quality.
引用
收藏
页码:940 / 949
页数:10
相关论文
共 32 条
[1]
THE SCANNING GRID - A NOVEL AND EFFECTIVE BUCKY MOVEMENT [J].
BARNES, GT ;
MORELAND, RF ;
YESTER, MV ;
WITTEN, DM .
RADIOLOGY, 1980, 135 (03) :765-767
[2]
SCANNING MULTIPLE SLIT ASSEMBLY - PRACTICAL AND EFFICIENT DEVICE TO REDUCE SCATTER [J].
BARNES, GT ;
BREZOVICH, IA ;
WITTEN, DM .
AMERICAN JOURNAL OF ROENTGENOLOGY, 1977, 129 (03) :497-501
[3]
Anthropomorphic versus geometric chest phantoms: A comparison of scatter properties [J].
Baydush, AH ;
Ghem, WC ;
Floyd, CE .
MEDICAL PHYSICS, 2000, 27 (05) :894-897
[4]
SCATTER FRACTIONS IN AMBER IMAGING [J].
CHOTAS, HG ;
FLOYD, CE ;
DOBBINS, JT ;
LO, JY ;
RAVIN, CE .
RADIOLOGY, 1990, 177 (03) :879-880
[5]
SMALL OBJECT CONTRAST IN AMBER AND CONVENTIONAL CHEST RADIOGRAPHY [J].
CHOTAS, HG ;
VANMETTER, RL ;
JOHNSON, GA ;
RAVIN, CE .
RADIOLOGY, 1991, 180 (03) :853-859
[6]
Cristy M, 1987, SPECIFIC ABSORBED FR, V1-7
[7]
DQE(F) OF 4 GENERATIONS OF COMPUTED RADIOGRAPHY ACQUISITION DEVICES [J].
DOBBINS, JT ;
ERGUN, DL ;
RUTZ, L ;
HINSHAW, DA ;
BLUME, H ;
CLARK, DC .
MEDICAL PHYSICS, 1995, 22 (10) :1581-1593
[8]
MEASUREMENT OF SCATTER FRACTIONS IN CLINICAL BEDSIDE RADIOGRAPHY [J].
FLOYD, CE ;
BAKER, JA ;
LO, JY ;
RAVIN, CE .
RADIOLOGY, 1992, 183 (03) :857-861
[9]
Imaging characteristics of an amorphous silicon flat-panel detector for digital chest radiography [J].
Floyd, CE ;
Warp, RJ ;
Dobbins, JT ;
Chotas, HG ;
Baydush, AH ;
Vargas-Voracek, R ;
Ravin, CE .
RADIOLOGY, 2001, 218 (03) :683-688
[10]
System considerations in CCD-based x-ray imaging for digital chest radiography and digital mammography [J].
Hejazi, S ;
Trauernicht, DP .
MEDICAL PHYSICS, 1997, 24 (02) :287-297