Visualization of distribution in the vitreous cavity via eye drops using ultra-heavily T2-weighted sequences in MRI: a preliminary study with enucleated pig eyes.

IF 1.7 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Radiological Physics and Technology Pub Date : 2024-09-01 Epub Date: 2024-07-18 DOI:10.1007/s12194-024-00826-6
Yutaka Kato, Kenya Yuki, Koji Nishiguchi, Shinji Naganawa
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Abstract

We investigated whether magnetic resonance imaging can visualize the distribution in the vitreous cavity via eye drops of ophthalmic solutions, gadolinium-based contrast agent, and 17O-water, and to clarify the usefulness of ultra-heavily T2-weighted sequences in the research of intraocular distribution. Five different solutions (V-ROHTO, TRAVATANZ, gadobutrol, H217O, and saline) were administered to excised pig eye specimens. The samples were scanned using T1 mapping, T2 mapping, 3D T2-weighted (echo times (TE): 500, 3200, and 4500 ms), a half-Fourier single-shot turbo-spin echo sequence (HASTE; TE: 440 and 3000 ms), and 3D-real inversion-recovery before eye drops administration. Subsequently, we used a plastic dropper to drop a 0.5 mL solution each, and images were obtained up to 26 h later. Temporal changes in the T1 and T2 values of the anterior chamber and vitreous cavity were compared. The other sequences were evaluated by determining temporal signal changes as signal intensity ratio (SIR) compared to "No drop." The T1 and T2 values of samples treated with gadobutrol and H217O decreased over time. The SIR of samples treated with gadobutrol and H217O showed remarkable changes in the 3D T2-weighted images, whereas no remarkable temporal changes were observed in the other solutions. Longer TEs resulted in remarkable changes. We demonstrated that visualization of distribution in the vitreous cavity via eye drops could be achieved with excised pig eyes using gadobutrol and H217O, but not with ophthalmic solutions. Ultra-heavily T2-weighted sequences may be promising for the early and highly sensitive visualization of the intraocular distribution of eye drops.

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利用磁共振成像中的超高 T2 加权序列观察滴眼液在玻璃体腔中的分布:对去核猪眼的初步研究。
我们研究了磁共振成像能否通过滴眼液、钆基造影剂和 17O 水观察到玻璃体腔内的分布,并明确了超高 T2 加权序列在研究眼内分布中的作用。对切除的猪眼标本注射了五种不同的溶液(V-ROHTO、TRAVATANZ、钆布醇、H217O 和生理盐水)。使用 T1 映像、T2 映像、三维 T2 加权(回波时间 (TE):500、3200 和 4500)扫描样本:500、3200 和 4500 毫秒)、半傅里叶单发涡轮自旋回波序列(HASTE;TE:440 和 3000 毫秒)和三维真实反转恢复进行扫描。随后,我们用塑料滴管滴入每人 0.5 mL 溶液,并在 26 小时后获取图像。比较前房和玻璃体腔的 T1 和 T2 值的时间变化。与 "不滴 "相比,其他序列的时间信号变化以信号强度比(SIR)的形式进行评估。使用钆布醇和 H217O 治疗的样本的 T1 和 T2 值随着时间的推移而下降。使用钆布醇和 H217O 治疗的样本的 SIR 在三维 T2 加权图像中显示出显著变化,而在其他方案中未观察到明显的时间变化。更长的 TE 会导致显著的变化。我们证明,使用钆布醇和 H217O,而不使用眼药水,可以通过切除的猪眼球观察到玻璃体腔内的分布情况。超高 T2 加权序列可能是早期高灵敏度观察眼药水在眼内分布的有效方法。
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来源期刊
Radiological Physics and Technology
Radiological Physics and Technology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
3.00
自引率
12.50%
发文量
40
期刊介绍: The purpose of the journal Radiological Physics and Technology is to provide a forum for sharing new knowledge related to research and development in radiological science and technology, including medical physics and radiological technology in diagnostic radiology, nuclear medicine, and radiation therapy among many other radiological disciplines, as well as to contribute to progress and improvement in medical practice and patient health care.
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