https://www.selleckchem.com/products/Rapamycin.html 05)1.30,0.52-2.77 cm3 forTOF;0.84,0.28-1.74 cm3 forUTE(median, range). The scan time forUTE-MRA was 2 minutes and 52 seconds. To understand the characteristic feature of the artifacts from the clip could contribute to define vascular structure in image interpretation. Adding UTE-MRA to routine protocol is useful approach for follow-up imaging after cerebral aneurysm clipping with clinically acceptable prolongation of the scan time.PURPOSEA virtual monochromatic image(VMI)is acquired from two different types of polychromatic energy X-rays, not a monochromatic X-ray. The effective energy of monochromatic X-ray does not vary in passing through the patient's body. On the other hand, beam hardening effects are seen in images because of the change of polychromatic X-ray energy. The purpose of the present study was to evaluate the beam hardening improvement effect ofVMI using a phantom with a bone mimicking ring.METHOD We used a water equivalent electron density phantom with a hole in the center for inserting various measurement materials(i.e. fat, two types of bone with differing densities, contrast medium, blood, and water). Then, the CT numbers of each measurement materials were obtained from single energy CT(SECT) images and VMIs, respectively. Also, an additional bone-mimetic ring was used to obtain the CT numbers for evaluation of beam hardening effect. The CTnumber change rates were calculated from the obtained CT numbers with and without beam hardening effect.RESULT The rate ofCTnumber, change ofVMI was significantly lower than that ofSECTfor all measured materials.CONCLUSION In this study,VMI minimized changes inCT numbers due to the beam hardening effect and showed a higher beam hardening reduction effect.PURPOSEX-ray film or computed radiography(CR) system has been employed in clinical setting, and these devices are gradually replaced by portable flat-panel detector(FPD) systems. The