PMID- 17538224
OWN - NLM
STAT- MEDLINE
DCOM- 20070710
LR  - 20190911
IS  - 0369-4305 (Print)
IS  - 0369-4305 (Linking)
VI  - 63
IP  - 5
DP  - 2007 May 20
TI  - [Examination of scan parameters that influence image quality in three-dimensional 
      rotational angiography(3D-RA)].
PG  - 577-85
AB  - Because the imaging qualities of three-dimensional rotational 
      angiography(3D-RA)are influenced by various imaging parameters, it is difficult 
      to obtain high-quality images from 3D-RA. In this study, we compared two methods 
      of 3D-RA, the propeller rotation technique(PRT)and the roll rotation 
      technique(RRT)by changing image intensifier(I.I.)sizes(5, 7 and 9 inches)using a 
      test chart and handmade phantom. The results of this study demonstrated that one 
      of the factors determining the image quality of 3D-RA was spatial resolution. 
      Therefore, it was important to choose an optimum I.I. size that was similar in 
      size to collimating the region of interest(ROI)in clinical use. Another factor 
      influencing image quality was radiographic condition, especially the setting of 
      tube voltage. This factor was indispensable in obtaining good image contrast, but 
      the use of high-voltage exposure was one of the reasons for lower image contrast. 
      Therefore, if image contrast was insufficient, the image qualities of 3D-RA 
      became worse with increasing tube voltage because the tube voltage in this study 
      was automatically changed according to scanning method and I.I. size. In 
      addition, because the spatial resolution of PRT was similar to that of RRT, we 
      thought it better to use PRT because the data acquisition time(scan time)of this 
      technique was 4 seconds shorter than that of RRT, whereas, if PRT was used, it 
      was necessary to set a suitable rate of injection of contrast medium because the 
      setting of the tube voltage of PRT was 10 kV higher than that of RRT. In 
      conclusion, to improve the image qualities of 3D-RA, we considered it necessary 
      to obtain sufficient image contrast not influenced by high tube voltage and to 
      choose an optimum I.I. size suitable for the spatial resolution of ROI.
FAU - Naramidate, Naoko
AU  - Naramidate N
AD  - Department of Radiology, Sapporo Azabu Neurosurgical Hospital.
FAU - Kodera, Shuichi
AU  - Kodera S
LA  - jpn
PT  - Comparative Study
PT  - English Abstract
PT  - Journal Article
PL  - Japan
TA  - Nihon Hoshasen Gijutsu Gakkai Zasshi
JT  - Nihon Hoshasen Gijutsu Gakkai zasshi
JID - 7505722
SB  - IM
MH  - Angiography/*methods
MH  - Imaging, Three-Dimensional/*methods
MH  - Phantoms, Imaging
MH  - Rotation
EDAT- 2007/06/01 09:00
MHDA- 2007/07/11 09:00
CRDT- 2007/06/01 09:00
PHST- 2007/06/01 09:00 [pubmed]
PHST- 2007/07/11 09:00 [medline]
PHST- 2007/06/01 09:00 [entrez]
AID - JST.JSTAGE/jjrt/63.577 [pii]
AID - 10.6009/jjrt.63.577 [doi]
PST - ppublish
SO  - Nihon Hoshasen Gijutsu Gakkai Zasshi. 2007 May 20;63(5):577-85. doi: 
      10.6009/jjrt.63.577.