can be corrected by division into the pre-acquired image. this popular model in describing the iih effect is: x = α x ′ + ξ where x is the measured intensity, x ′ is the true intensity, α is the iih effect and ξ is the noise. this method is advantageous because it can be conducted offline, i.e, the patient is not required to be in the scanner. therefore, correction time is not an issue. however, this technique does not improve snr and contrast of the image because it only utilizes information that was already acquired. since the b1 field was not homogeneous when the images were acquired, the flip angles and subsequent acquired signals are imprecise. the effects of an ai-based image post-scan processing denoising system in brain scans have been demonstrated to be effective in higher image quality and morphometric analysis. post-scan image processing systems enable noise reduction while retaining contrast. the subsequent image enhancement can be processed with shorter scan times for higher throughput and plausible earlier detection. b1 mapping techniques for image post-processing corrections to correct rf inhomogeneity artifacts using post-processing corrections, there are a few methods to map the b1 field. here is a short description of some common techniques. double angle method a common and robust method that uses the results from two images acquired at flip angles of α and 2 α . the b1 map is then constructed using a ratio of the signal intensities of these two images. this method, although robust and accurate, requires a long tr and long scan time; therefore, the method is not optimal for imaging regions susceptible to motion. phase map method similar to the double angle method, the phase map method uses two images; however, this method relies on the accrual of phase to determine the real flip angle of each spin. after applying a 180 degree rotation about the x-axis followed by a 90 degree rotation about the y axis, the resulting phase is then used to map the b1 field. by obtaining two images and subtracting one from the other, any phase from b0 inhomogeneity can be removed and only phase accumulated by the inhomogeneous rf field will be mapped. this method can be used to map 3d volumes but requires a long scan time, making it unsuitable for some scanning requirements. dual refocusing echo acquisition mode (dream) this method is a multislice b1 mapping technique. dream can be used to acquire a 2d b1 map in 130 ms, making it insensitive to motion and feasible for scans that require breath holds, such as cardiac imaging. the short acquisition also reduces effects of chemical shifts and susceptibility. additionally, this method requires low sar rates. although not as accurate as the double angle method, dream achieves reliable b1 mapping during short acquisitions. t