International Journal of Radiation Research
نشریه پرتو پژوه
Int J Radiat Res
Basic Sciences
http://ijrr.com
79
journal79
2322-3243
2345-4229
10.61186/ijrr
en
jalali
1389
3
1
gregorian
2010
6
1
8
1
online
1
fulltext
en
The effect of focal spot size on the spatial resolution of variable resolution X-ray CT scanner
Medical Physics
Medical Physics
تحقيق بديع
Original Research
<span style="font-weight: bold">Background:</span> A variable resolution X-ray (VRX) CT
scanner provides a great increase in the spatial
resolution. In VRX CT scanners, the spatial resolution
of the system and its field of view (FOV) can be
changed according to the object size. One of the main
factors that limit the spatial resolution of VRX CT
scanner is the effect of the X-ray focal spot. <span style="font-weight: bold">Materials
and Methods: </span>A theoretical study of the effect of X-ray
focal spot on the spatial resolution of VRX CT is
presented in this paper. In this study, we used the
parameters of an actual VRX CT scanner. By using the
relevant equations, the effects of foal spot sizes of
0.6 and 0.1 mm were calculated on spatial resolution
of the system at various opening half angles. <span style="font-weight: bold">Results:</span>
Focal spot size of 0.6 mm had no significant effect on
spatial resolution of the system for opening half
angles of above 14°. Even focal spot sizes of larger
than 0.6 mm could not affect the spatial resolution of
the system. For opening half angles of below 14°,
foal spot size of 0.6 mm limited the spatial resolution
of the system to 5.7 cycle/mm and caused great
spatial resolution non-uniformity along the detector
length. <span style="font-weight: bold">Conclusion: </span>By focal spot size of 0.1 mm,
the spatial resolution varied as a function of the
opening half angle and increased to more than 30
cycle/mm. Additionally, focal spot size of 0.1 mm
minimized the spatial resolution non-uniformity along
the detector length. Iran. J. Radiat. Res., 2010 8 (1):
37-43
Variable resolution X-ray (VRX) CT scanner, focal spot size, spatial resolution.
37
43
http://ijrr.com/browse.php?a_code=A-10-1-349&slc_lang=en&sid=1
H.
Arabi
790031947532846001817
790031947532846001817
No
A.R.
Kamali Asl
A_R_Kamali@yahoo.com
790031947532846001946
790031947532846001946
Yes
S.M.
Aghamiri
790031947532846001947
790031947532846001947
No