?CT?????????

1
?2? CT??????????? ??????????
?CT????????? ????????? ?????? ????
2
CT????,????????????.
3
????????....
10mm
5mm
2mm
SD4
SD10
SD6
4
QA?? ????CT????????
5
Question 1
CT???????????????
6
Answer
?????? ?????(X??????????) ????????????????...
????? -gt ??????(v)???? ?????????????????????????
4 -gt 2 .....50 25 -gt 5 .....20 100
-gt 10 .....10 10000 -gt 100 .....1
7
????????
SD4 ???? 200mA ??????? 10mm?
SD6 100mA 5mm?
SD10 ?50mA 2mm?
8
???????????????
10mm
5mm
2.5mm
9
Question 1.1 ????????,???????????.???? v2?????,?
???????????
10
Answer
?????.
?????5mm
?????10mm
????,??????...
11
????MTF???
????????????????????
12
??????????
A
10mm 200mA????????
A 200mA
B 200mA
B
????????????
13
Question 2
??????????????????
14
Answer
????????????? ????????????????
SD5
SD2
SD8
????
???????
??????
???????????????????????? ???????????????????
15
???????
Low-pass???????
??????????????? ???????????????? ???????...
16
????????????????? ????????????
???????????????????...
17
???????????????
?????
?????
????????????? ?????????????????????
18
?????????? SD 8
??????
?????
????????????????????? ?????????????????????
19
??? ? ?????
1.0
0
1.0
0
(cycles/mm)
(cycles/mm)
20
??? ? ?????
1.0
0
1.0
0
(cycles/mm)
(cycles/mm)
21
Question 3
???????? ???????????????? Hint ??????????
??????
22
Answer
??????????????
????????????????
WW200
WW100
23
Window width?????????
WW25
WW50
WW200
WW100
24
?????????????
?????????????????????
25
??? ? ?????
1.0
0
1.0
0
(cycles/mm)
(cycles/mm)
26
??CT??,?????????????? ??.??????????????????.
??WW
???????
????
?????
???????
?????
27
Question 4
???????????? 1.???? 2.???? ???
28
Answer
1.?????? ?????????? 2.??????
SD?????????????(WS)
29
?????????????????
????????
30
Question 4.1
????????????????? ??????????????(?)???????
31
Answer
????????????????????? 2mm?? (??????????????)
10mm
5mm
??0
??-20
??0
??-20
2mm
?????? ?????
??????? ?????
32
????????????
10mm
7mm
CT? ??????20
5mm
3mm
SD 5
SD 3
SD 8
SD 10
33
Question 4.2
SD???????????????? ??????
34
Answer
SD???????????????? ?????????????????
???SD6???
??1
??2
??3
35
Question 5
CT???A???????16?B??????????16?? ???????120kV200mA?
??0.7??????????? ?????10mm??????? SD??????
??????16 5.1 ?????????16
7.3 ????? ????????????????16??????????? ?????????
?? ?????????????????
36
Answer ??????????? ???.....
37
??1. ??????????????????????? ???????????????
38
??2. ?????10mm???????????????
?SSP????????????????? (???????,????????)
????????????????
39
??????????? 1. ????????????????????????16
????? 2.??????????????SD????????
????????????????????? ??????? 3.??,?????????????
????????? ???????????
40
Question 6
CT????????3???????????? ?????????
?
?
?
41
Answer
????
????CT? 200
SD0
SD20
SD7
42
????3????????????
???????????????? ????????????????????????
43
3?????????????
???????SD?????????? SD?1/2??????4??????? ???
????????????????????? SD?1/2???????????????2??
???????????????????? ?????????? ???... ???
?????????????????????
44
Question 6 ??????, ????????,4?,16?,?????? ????
45
Answer 6
????????,????????.???... ?????????, ???? ?
4? ? 16? ??? ???? 4? 16?
46
?????????,????????? ????????,??????. (???????,????
????)
???? ????
????
????
???????????,?????? ???????????.
47
????????...
16?????16
???? ???1
4? ???5
16? ???16
???? 4????3
48
????????????????????? ????CT?????????????????? ??
????????????????????? ????
49
????, Question6.1
????????
????????????
???
?????????????.
????????
50
Answer
???.
????????
????????????
?????????????.
???
?????????,???????????? ???,???????????????????.
?????,???????????????? ????,????????.
(Effective mAs???????????)
51
???
CT???????????????... 1. ???????,???????.
(???????,???UP?) 2. ?????????????????????
???????. 3.????????????,???????. 4.
3??CTA?,?????????.
52
????? ???????????????