About 25% of patients in the study screened with a CT needed follow-up tests, which add to the expense.

此项研究中约25%受过CT扫描的病人需要继续检查。这需要更多的费用。

youdao

The body needing to be examined is first scanned using a computed tomography (CT) machine, a process which takes about 20 seconds and creates up to 25, 000 images, each one a slice through the body.

需要进行尸检的尸体首先要用CT机进行扫描，这一过程需要20秒左右，然后会生成将近25000个图像——尸体的截面图像。

youdao

Ct scan is like an X-ray, but it USES multiple images to build up a more detailed, three-dimensional (3-d) picture of your brain.

CT扫描是像X光，但它使用多张图片，建立一个更详细的，三维(3 -丁)你的大脑的图片。

youdao

Each point in each slice of a CT scan is essentially a separate test, and the chance that a whole body CT scan is going to turn up something somewhere that looks funny is nearly 100%.

FORBES: Why Personalized Medicine Is Bunk

But the fact that centers were able to use at least one radiation-reduction technique in most patients "should serve as a wake-up call to cardiac CT laboratories that do not routinely use these methods, " Einstein writes in his editorial.

CNN: Heart test can pack radioactive wallop

He seemed to have developed an infection, but our X-rays and CT scans failed to turn up a source.

NEWYORKER: The Checklist