Introduction: Magnetic resonance imaging of the heart is used worldwide today in the field related to cardiovascular disease. The biggest advantage of magnetic resonance imaging of the heart is the three-dimensional display of structures with excellent spatial and high contrast resolution. It enables the measurement of cardiac function and the assessment of morphological structures. Advances in technology have made imaging possible with T1 and T2 mapping. Purpose: To determine the native values of T1 and T2 mapping in healthy subjects and to determine the influence of the test field on the values of T1 and T2 relaxation time when performing T1 and T2 mapping. Methods: 30 healthy volunteers were included in the study. The study was performed on a Siemens Magnetom Aera 1.5 T MR. None of the volunteers had a known history of known cardiovascular disease or risk factors. For each volunteer, we performed native T1 and T2 mapping of the heart muscle at different image field sizes. We performed a size correction of the FOV by increasing the size by 10 mm, from 360 mm to 390 mm. In the second part of the research, we plotted areas of interest in the interventricular septum in a computer program and recorded measurements. Results: A comparison between image field sizes in T1 mapping showed that there are minimal statistical differences in the values of T1 relaxation times. All measured and calculated values are within the reference values of T1 relaxation times. A comparison between the image field sizes in T2 mapping showed that there are no statistically significant differences in the values of T2 relaxation times. All measured and calculated values are in the approximate reference values T2 of relaxation times. During the research, we found that there are gender differences in both T1 and T2 mapping. Discussion and conclusion: We found that the average native values of T1 and T2 mapping are comparable with the results of other studies and that they can be compared with the native reference values of a healthy myocardium. In the second part of the study, we investigated whether the size of the image field affects the measured values of T1 and T2 mapping in MR imaging of the heart. We found that there are individual minimal differences between the calculated values of T1 and T2 relaxation times, but the measured values are still within normal values.
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