Sentence examples for background of the phantom from inspiring English sources

(iv) The density difference between the background of the phantom and an added test object, used to assess image contrast, shall be measured and shall not vary by more than ±0.05 from the established operating level.

On the images that were corrected using the CT, the number of counts is evenly spread across the entire background of the phantom, thus making the background homogeneous.

The background of the phantom was filled with 20 MBq 18F and the spheres with a 10 times higher radioactivity concentration than the background, and the phantom was scanned on the Discovery PET-CT and the Signa PET-MR for 15 min each.

Other recommendations If the department has a calibrated well counter available (see calibration procedure), this is the tool of preference with which to determine/verify the exact concentration of activity in the spheres and in the background of the phantom.

The background of the phantom in this paper had an absorption coefficient of μ a = 0.01 mm−1 and a reduced scattering coefficient of μ ′ s = 0.6 mm−1.

After reconstruction, the contrast to background ratio was calculated by determining the mean value of the reconstruction results for the nodes of the mesh within the region of expected Teflon signal and dividing by the mean value of the reconstruction for the nodes representing the gelatin background of the phantom.

Filling of background compartment of image quality phantom: Fill background compartment completely with water Remove 30 ml water from the background compartment of the phantom Add 20 MBq FDG in the background compartment.

Fill background compartment completely with water Remove 30 ml water from the background compartment of the phantom Add 20 MBq FDG in the background compartment.

After each scan, the solution in each syringe was sequentially injected into the background volume of the phantom, thus changing the sphere to background ratio from the initial zero background activity to a ratio of 15 to 1, 7.5 to 1, 3.75 to 1, and finally, 1.88 to 1, with each new injection of activity from the prepared syringes.

When the phantom was prepared for scanning at the various contrast ratios, the background volume of the phantom was sampled using a pipette to extract 500 μL of the background volume and placed in vials.

Figure 3c shows the mean measured versus true activity concentration in the 37 mm VOI in the warm background compartment of the phantom along the identity line, and Fig. 3d shows the percent deviation in this background activity concentration.