From f75f0bb0968146e14efe68c01a5adb78753f154c Mon Sep 17 00:00:00 2001 From: Jamal Grimwade Date: Wed, 19 Nov 2025 21:18:07 +0800 Subject: [PATCH] Add Understanding Blood Oxygen and Its Importance --- Understanding-Blood-Oxygen-and-Its-Importance.md | 7 +++++++ 1 file changed, 7 insertions(+) create mode 100644 Understanding-Blood-Oxygen-and-Its-Importance.md diff --git a/Understanding-Blood-Oxygen-and-Its-Importance.md b/Understanding-Blood-Oxygen-and-Its-Importance.md new file mode 100644 index 0000000..08f322c --- /dev/null +++ b/Understanding-Blood-Oxygen-and-Its-Importance.md @@ -0,0 +1,7 @@ +
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When increasing the slice numbers to 36, the proposed technique ends in scalp fat signal aliasing into the lower a part of the coronal images even within the presence of fat saturation pulse preceding the excitation pulse (Fig. 9), by which increased FOV alongside the slice route covers the displacement of the fat alerts relative to the water signals. Therefore, you will need to account for this potential fat confound launched by the water-fat shift, and there are just a few potential ways to handle the problem. The first approach is to make use of a reverse gradient method by shifting the fats contribution in an opposite route for excitation and [BloodVitals health](http://kcinema.egong.net/bbs/board.php?bo_table=free&wr_id=1047807) refocusing pulses (64, 65), thereby resulting in the excited fats spin dephasing during each refocusing pulse. Another answer is to regulate the amplitude of the slab selective gradient by altering the pulse duration between the excitation and refocusing (66). Using the completely different amplitudes of the slice gradient for excitation and refocusing pulses, the fats shift displacement occurs at different positions, thus attaining fat signal suppression while only refocusing the water spins.
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The proposed technique is a simple extension of SE-EPI (7, 8) by including a number of RF refocusing pulses to achieve three-dimensional imaging. Nevertheless, the proposed technique is totally different from SE-EPI in that T1-weighted stimulated echo contribution to the sign is instantly concerned with VFAs in the later part of the echo practice. That's, the proposed technique increases diffusion time of the local magnetic field gradients surrounding deoxyhemoglobin-containing capillaries and venules, resulting in increased Bold sensitivity at the price of moderate specificity between GE- and SE-EPI. Alternatively, balanced regular-state free precession (bSSFP) (69, 70) is composed of spin and stimulated echoes from earlier TR just like the proposed technique, thus leading to comparable Bold contrast although a detailed evaluation of its impact on the specificity has not been revealed. Additionally, it additional improves picture sharpness due to a property of a steady-state for each TR. However, bSSFP nonetheless has some limitations in detecting T2-weighted Bold distinction as a result of potential banding artifacts and reaching high decision due to the bigger variety of PE lines in comparison with the zoomed imaging of the proposed methodology.
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