VOA慢速英語: 3D打印技術(shù)為心臟手術(shù)提供三維模型

[ti:3-D Printing Adds New Dimension to Heart Surgery] [ar:Jonathan Evans] [al:Technology Report] [00:00.00]From VOA Learning English, this is the Technology Report. [00:04.95]Researchers are now using three-dimensional, [00:09.49]or 3D printing to create models [00:12.73]of the human heart to help heart specialists. [00:16.17]The heart doctors can use the models [00:19.24]to better help patients before an operation. [00:22.64]Surgeons regularly use digital images [00:26.55]to explore the heart in close detail. [00:29.43]But no two human hearts are alike. [00:32.82]This led Matthew Bramlet [00:35.29]to create exact heart models from those images. [00:39.44]Dr. Bramlet is a pediatric or children's heart expert [00:44.64]at the University of Illinois College of Medicine. [00:48.38]He says the 3-D models show information [00:52.07]he cannot get any other way. [00:55.01]"Even when I will take the MRI and render the images, [00:59.14]even a print heart that is sort of spinning on the screen, [01:04.92]it's still a 2-D screen. [01:07.03]And so what we've done with the printed models, [01:09.76]we've pulled it out of the screen [01:11.21]so that you can actually hold it in your hand [01:12.93]and evaluate the anatomy for the first time [01:15.79]in a manner that makes sense and is logical." [01:18.84]A 3-D printer uses images from a digital display [01:23.69]to create a physical model of a human heart. [01:27.80]Matthew Bramlet says doctors can use the model, [01:32.12]in his words, "to understand the anatomy for the first time." [01:36.79]Pictures from medical tests like CAT scan or MRI [01:42.11]are sent to a 3-D printer to create a heart [01:46.10]in a plaster or clay form. [01:48.67]The printer then constructs the heart, [01:52.08]thin layer by thin layer. [01:54.66]Dr. Bramlet says the model matches the real heart in every detail. [02:00.34]"When we're done with the model and made our decision, [02:04.25]we want to be able to go back to the source image [02:07.58]and confirm those findings," he says. [02:10.24]Dr. Bramlet has built model hearts [02:14.40]for different kinds of heart operations. [02:17.42]All of the operations were successful. [02:20.84]In his first case, [02:22.54]digital images showed only one tiny hole in a baby's heart. [02:28.51]But, the 3-D printed model showed several defects [02:33.24]or problems that the baby was born with. [02:36.55]Dr. Bramlet says those defects could not be seen easily in the images. [02:42.64]The heart surgeon was able to change the type of surgery [02:47.13]for the patient based on the 3-D model. [02:50.35]He added that 3-D heart models saves time during heart operations. [02:57.00]Kathy Magliato is a cardiac surgeon [03:01.50]at Saint John's Health Center in Los Angeles. [03:05.32]She welcomes the new technology. [03:08.55]She says it could help her make better decisions [03:12.42]before she operates on the hearts of her patients. [03:16.49]"The fact that I can then take this very complicated structure, [03:21.74]which has endless possibilities [03:24.68]of what it could look like anatomically when I open the body, [03:28.46]and you give it to me before the operation [03:30.27]and I can hold it in my hand [03:31.98]and plan an operation around what I'm seeing, [03:35.04]touching and feeling. [03:36.16]That to me is what can potentially change the game [03:39.95]in an operation and save lives." [03:42.02]Matthew Bramlet continues to research the technology. [03:46.07]He is working with the National Institutes of Health [03:49.96]to build a 3-D library that includes heart models [03:54.21]and images that others can use. [03:57.80]I'm Jonathan Evans.

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