English translation: serial CT [computer tomography] imaging
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I would say that the "seriado" is "helical" or "spiral" in this case.
Here's a definition from medicinenet.com
A helical CAT scan is a new specialized CAT scan technique that involves continuous movement of the patient through the scanner with the ability to scan faster and with higher definition of internal structures. Helical CAT scanning can permit greater visualization of blood vessels and internal tissues, such as those within the chest cavity.
scalesj Spain Native speaker of: English PRO pts in pair: 32
Explanation: If you search for serial CT scan (serial computer tomography scan studies) you would get plenty of examples in the medical literature. I took one example from medline:
Emphysematous pyelonephritis- conversion of type i
to type II appearance on serial CT studies. Komura S, Shindoh N, Minowa O, Ozaki Y, Kyogoku S, Sumi Y. Clin Imaging. 1999 Nov-Dec;23(6):386-8.
Dito Local time: 11:12 Native speaker of: Spanish PRO pts in pair: 94