Design a new intravascular coil with high uniform SNR distribution to reduce the MRI image artifact of vessel walls caused by the blood pulsed movement.According to the antenna theory, adding parasitic elements to the RF coil design can increase the homogeneity of magnetic fields produced around the coil [1]. Developing this idea, we introduced a new monopole MR antenna with three parasitic elements. The proposed coil has 4cm length and a diameter of 2.2 mm (See Fig. 1a). Lengths of the coil parasitic elements are optimized at 63.875 MHz using a genetic algorithm implemented by involving MATLAB and HFSS. They are obtained as 1, 33, 1 mm respectively. The optimization process has performed by defining a cost function;$$$ Cost = Total ISNR × Homogeneity$$$. Intrinsic SNR (ISNR) is a reliable measure to quantify the role of coil parameters in the MRI image SNR which is defined by $$$ ISNR=k×H_+/√(1-s₁₁²) $$$ where, K is a constant coefficient for a given sample, S₁₁ is the ratio of the reflected power to the input power at the coil’s feed point (point A at Fig. 1a,b) H₊ is the right-hand circularly polarized magnetic field component, and R is the real part of the input impedance seen across the coil input terminals. Total ISNR is the sum of the ISNR data throughout of the phantom and Homogeneity is defined as the inverse variance of the ISNR data of the phantom which is defined as $$$ Homogeneity=1/ISNR_STD $$$.Figures 2 and 3 show 2D ISNR maps of the introduced coil (Fig. 1a) and a previously presented monopole coil with one parasitic element [3](Fig. 1b) in a sagittal plane (Fig. 1c) inside a saline phantom (Fig. 1d). Decreasing the signal intensity but increasing the signal homogeneity are resulted in the introduced coil maps. Figure 4 illustrate the ISNR variation of the proposed coil and the coil with one parasitic elements along a longitudinal line placed 0.5 cm away from the z axis. Increasing the ISNR homogeneity and decreasing the maximum ISNR index of the introduced coil are highlighted in this figure. Table 1 verifies that the Maximum ISNR and Total_ISNR of the introduced coil have decreased by less than 2 times. However, the ISNR homogeneity of and then the cost function of the introduced coil has increased by 2.9 and 1.24 times respectively.In this paper we introduced a monopole coil with three parasitic elements and assessed the ISNR values and homogeneity of the coil inside a saline phantom. Results show that adding parasitic elements to the coil design increases the uniformity of ISNR distribution, which in turn, it will increase MRI image contrast to noise ratio (CNR) by decreasing the vessel wall movement artifact.