PROCEEDINGS OF THE 7 INTERNATIONAL ... - Fizika

More documents

Recommendations

Info

L. Bumbure et al. / Medical Physics in the Baltic States 7 (2009) 11 - 14 2. The higher kV for x-ray tubes were provided, the smaller was the range of digital x-ray image brightness (Fig.9). 3. The higher kV for x-ray tubes were provided, the larger was variance of each histogram (Fig. 10-12) Table 1. Average brightness in dependence on kV Nr. of Computed radiography system Area Agfa Philips 50kV Kodak 1 46 71 36 4 201 201 174 7 235 241 60kV 231 1 49 77 31 4 181 189 165 7 227 226 70kV 226 1 55 83 39 4 174 181 160 7 221 218 80kV 222 1 53 86 37 4 166 176 147 7 215 212 90kV 210 1 53 88 33 4 146 171 142 7 199 208 100kV 207 1 54 89 37 4 140 168 136 7 193 204 197 Table 2. Brightness range in dependence on kV Amount of brightness gradations (brightness range) in dependence of kV CR system kV Agfa Philips Kodak 50 188 168 193 60 175 150 191 70 166 134 184 80 160 127 176 90 144 119 175 100 136 116 161 13 Table 3. Variance in dependence on kV CR system kV Agfa Philips Kodak Avarage brightness Average brightness Variance of 1st area of brightness histogram 50 4.39 7.82 16.86 60 6.48 8.7 18.42 70 7.1 9.3 20.57 80 7.87 9.9 24.28 90 8.02 10.14 26.83 100 8.4 12.48 27.43 Variance of 4th area of brightness histogram 50 16.1 9.3 21.47 60 25.76 18.34 29.6 70 32.86 20.9 29.24 80 43.77 25.42 31.07 90 43.81 26.03 31.89 100 47.72 26.82 32.82 Variance of 7th area of brightness histogram 50 2.476 18.602 18.782 60 7.928 22.128 37.247 70 9.519 22.276 39.37 80 19.138 22.353 40.05 90 27.845 22.584 42.25 100 36.433 26.95 42.6 _ X of area Nr. 1 100 80 60 40 20 0 0 20 40 60 80 100 120 kV Fig. 6. Average Brightness of black area (the area Nr.1) _ X of area Nr. 4 220 200 180 160 140 120 100 40 50 60 70 80 90 100 110 kV AGFA PHILIPS KODAK AGFA PHILIPS KODAK
Average brightness Brightness range Variance Variance L. Bumbure et al. / Medical Physics in the Baltic States 7 (2009) 11 - 14 Fig. 7. Average Brightness of grey area (the area Nr.4) _ X of area Nr. 7 300 250 200 150 100 50 0 0 20 40 60 80 100 120 kV AGFA PHILIPS KODAK Fig. 8. Average Brightness of white area (the area Nb.7) 250 200 150 100 50 30 25 20 15 10 Brightness range in dependence on kV 0 0 20 40 60 kV 80 100 120 5 Fig. 9. Brightness range in dependence on kV Variance of brightness histogramm of 1st area 0 0 20 40 60 kV 80 100 120 60 50 40 30 20 10 Fig. 10. Variance of black area (the area Nb.1) Variance of brightness histogramm of 4th area 0 0 20 40 60 kV 80 100 120 AGFA PHILIPS KODAK Series1 Series2 Series3 Agfa Philips Kodak 14 Variance Fig. 11. Variance of grey area (the area Nb.4) Variance of brightness histogramm of 7th area 45 40 35 30 25 20 15 10 5 0 0 20 40 60 80 100 120 kV Fig. 12. Variance of white area (the area Nb.7) 4. Conslutions Series1 Series2 Series3 The achieved results demonstrate that digital image brightness statistical parameters – Brightness Average, Variance and Brightness range could be in use for quality assessment of the x-ray beam independently on x-ray machines and CR systems. 5. References 1. Bumbure L., Dekhtyar Y., Glazs A., Katashev A., Krechetova K., Mortuzane A. Evaluation of quality of digital X-ray image, Biomedical Engineering, Kaunas University of Technology, Technologija, 2008. p. 205-208. 2. Bumbure, J. Dehtjars, T. Kirsanova. Statistics of digital X-ray image brightness histograms, IFMBE Proceedings, 2009. Springer, p. 3. 3. Arhipova I., Bāliņa S. Statistika ar EXEL ikvienam, Datorzināibu centrs – 1999.
Page 1 and 2: 2009 PROCEEDINGS OF THE 7 th INTERN
Page 3 and 4: Executive editor: D.Adlienė CONFER
Page 5 and 6: 11.15-11.30 Daiva Leščiute, Valda
Page 7 and 8: MEDICAL PHYSICS IN THE BALTIC STATE
Page 9 and 10: S. Mattsson / Medical Physics in th
Page 11 and 12: S. Mattsson / Medical Physics in th
Page 13: L. Bumbure et al. / Medical Physics
Page 19 and 20: D. Lesciute et al. / Medical Physic
Page 23 and 24: D. Kaskelyte et al. / Medical Physi
Page 27 and 28: V. Poderys et al. / Medical Physics
Page 29 and 30: E D A B C V. Poderys et al. / Medic
Page 33 and 34: A. Kulbickas / Medical Physics in t
Page 37 and 38: M. Franckevicius / Medical Physics
Page 39 and 40: M. Franckevicius / Medical Physics
Page 41 and 42: J. Puiso et al. / Medical Physics i
Page 43 and 44: J. Puiso et al. / Medical Physics i
Page 45 and 46: T. Landberg et al. / Medical Physic
Page 55 and 56: S. Plaude et al. / Medical Physics
Page 59 and 60: Table 1. Optimization of number of
Page 63 and 64: C.-M. Nilsson / Medical Physics in
Page 65 and 66:
MEDICAL PHYSICS IN THE BALTIC STATE
Page 67 and 68:
S. Bernhardsson et al. / Medical Ph
Page 69 and 70:
S. Bernhardsson et al. / Medical Ph
Page 71 and 72:
2.3. Biological test. Y. Dekhtyar e
Page 73 and 74:
Page 75 and 76:
Scatter dose ( Gy /mA s) 1.55E-12 1
Page 77 and 78:
Page 79 and 80:
N. Kazuchits et al. / Medical Physi
Page 81 and 82:
V. Minialga et al. / Medical Physic
Page 83 and 84:
Temperature, o C 36 35 34 33 32 31
Page 85 and 86:
O. Klepalov et al. / Medical Physic
Page 87 and 88:
Page 89 and 90:
G. Adlys / Medical Physics in the B
Page 91 and 92:
G. Adlys / Medical Physics in the B
Page 93 and 94:
D. Mikšys / Medical Physics in the
Page 95 and 96:
L. Krynke et al.. / Medical Physics
Page 97 and 98:
Page 99 and 100:
M. Pučetaitė et al. / Medical Phy
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
D. Bernatavičius et al. / Medical
Page 107 and 108:
Page 109 and 110:
N. Vaiciunaite / Medical Physics in
Page 111 and 112:
D. Adlienė et al. / Medical Physic
Page 113 and 114:
MP Competences Generic Competences
Page 115 and 116:
Page 117 and 118:
S. Tabakov et al. / Medical Physics
Page 119 and 120:
J. Laurikaitienė et al. / Medical
Page 121 and 122:
R, % 100,0 99,5 99,0 98,5 98,0 97,5
Page 123 and 124:
S. Mockevičienė et al. / Medical
Page 125 and 126:
show all

PROCEEDINGS OF THE 7 INTERNATIONAL ... - Fizika

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?