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Tag: CT scans

Infection Control for COVID-19 Imaging

By STEPHEN BORSTELMANN, MD

Occasionally, you get handed a question you know little about, but it’s clear you need to know more.  Like most of us these days, I was chatting with my colleagues about the novel coronavirus. It goes by several names: SARS-CoV-2, 2019-nCoV or COVID-19 but I’ll just call it COVID.  Declared a pandemic on March 12, 2020 by the World Health Organization (WHO), COVID is diagnosed by laboratory test – PCR.  The early PCR test used in Wuhan was apparently low sensitivity (30-60%), lengthy to run (days), and in short supply.  As CT scanning was relatively available, it became an important diagnostic tool for suspected COVID cases in Wuhan.

The prospect of scanning thousands of contagious patients was daunting, with many radiologists arguing back and forth about its appropriateness.  As the pandemic has evolved, we now have better and faster PCR tests and most radiologists do not believe that CT scanning has a role for diagnosis of COVID, but rather should be reserved for its complications. Part of the reason is the concern of transmission of COVID to other patients or healthcare workers via the radiology department.

But then someone asked: “After you have scanned a patient for COVID, how long will the room be down?” And nobody really could answer – I certainly couldn’t.  A recent white paper put forth by radiology leaders suggested anywhere from 30 minutes to three hours. A general review of infection control information for the radiologist and radiologic technologist can be found in Radiographics.

So, let’s go down the rabbit hole of infection control in the radiology department. While I’m a radiologist, and will speak about radiology-specific concerns, the fundamental rationale behind it is applicable to other ancillary treatment rooms in the hospital or outpatient arena, provided the appropriate specifics about THAT environment is obtained from references held by the CDC.

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Can AI diagnose COVID-19 on CT scans? Can humans?

Vidur Mahajan
Vasanth Venugopal

By VASANTH VENUGOPAL MD and VIDUR MAHAJAN MBBS, MBA

What can Artificial Intelligence (AI) do?

AI can, simply put, do two things – one, it can do what humans can do. These are tasks like looking at CCTV cameras, detecting faces of people, or in this case, read CT scans and identify ‘findings’ of pneumonia that radiologists can otherwise also find – just that this happens automatically and fast. Two, AI can do things that humans can’t do – like telling you the exact time it would take you to go from point A to point B (i.e. Google maps), or like in this case, diagnose COVID-19 pneumonia on a CT scan.

Pneumonia on CT scans?

Pneumonia, an infection of the lungs, is a killer disease. According to WHO statistics from 2015, Community Acquired Pneumonia (CAP) is the deadliest communicable disease and third leading cause of mortality worldwide leading to 3.2 million deaths every year.

Pneumonias can be classified in many ways, including the type of infectious agent (etiology), source of infection and pattern of lung involvement. From an etiological classification perspective, the most common causative agents of pneumonia are bacteria (typical like Pneumococcus, H.Influenza and atypical like Legionella, Mycoplasma), viral (Influenza, Respiratory Syncytial Virus, Parainfluenza, and adenoviruses) and fungi (Histoplasma & Pneumocystis Carinii).

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The Testing Glut

In case you missed it, a recommendation came out last month that physicians cut back on using 45 common tests and treatments. In addition, patients were advised to question doctors who recommend such things as antibiotics for mild sinusitis, CT scans for an uncomplicated headache or a repeat colonoscopy within 10 years of a normal exam.

The general idea wasn’t all that new — my colleagues and I have been questioning many of the same tests and treatments for years. What was different this time was the source of the recommendations. They came from the heart of the medical profession: the medical specialty boards and societies representing cardiologists, radiologists, gastroenterologists and other doctors. In other words, they came from the very groups that stand to benefit from doing more, not less.

Nine specialty societies contributed five recommendations each to the list (others are expected to contribute in the future). The recommendations each started with the word “don’t” — as in “don’t perform,” “don’t order,” “don’t recommend.”

Could American medicine be changing?

For years, medical organizations have been developing recommendations and guidelines focused on things doctors should do. The specialty societies have been focused on protecting the financial interests of their most profligate members and have been reluctant to acknowledge the problem of overuse. Maybe they are now owning up to the problem.

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Rads are Good For You. Take Twice as Many.

Dear Mrs. Smith, I am writing to inform you that we exposed your body to an unnecessary level of radiation during your visit to our hospital. Oh, by the way, that was two years ago. We don’t intend to do anything about this for you. Also, we have known about this problem for a long time, and we don’t expect to change our procedures for future patients. Just wanted you to know. Yours in delivering the best health care in the world, Chief of Radiology and CEO. (Jointly signed.)

That’s the essence of this article by Walt Bogdanich and Jo Craven McGinty in the New York Times. Here are excerpts:

Long after questions were first raised about the overuse of powerful CT scans, hundreds of hospitals across the country needlessly exposed patients to radiation by scanning their chests twice on the same day, according to federal records and interviews with researchers.

Double scans expose patients to extra radiation while heaping millions of dollars in extra costs on an already overburdened Medicare program. A single CT scan of the chest is equal to about 350 standard chest X-rays, so two scans are twice that amount.

 

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Why We Should Think Twice About Getting A CT Scan

There’s an eerie video up on YouTube, shot by a Japanese journalist who ventured into the evacuation zone surrounding the Fukushima nuclear power plant, armed with a camera and a radiation meter. The video looks like b-roll footage from a low-budget zombie movie, with roving bands of stray dogs and a soundtrack of the radiation meter’s increasingly frantic beeping.

Shortly after the earthquake that damaged the plant, the Japanese government evacuated residents from a more than 1,000 square mile zone. Last week, they raised the severity level of the crisis at Fukushima to a 7 out of 7, making it the worst nuclear disaster since the complete meltdown of the reactor at Chernobyl, in 1986. In its wake, worldwide fear of nuclear power spiked. The German government shut down seven of its 17 nuclear reactors, and plans to eliminate nuclear power by 2020. In the U.S., a Fox News Poll conducted in early April found that 83 percent of respondents thought a similar disaster could happen to an American nuclear plant.

People fear radiation for good reason. All ionizing radiation passes unimpeded through cells of the body, mutating or destroying DNA along the way. The danger level depends on the dose and the length of exposure. We’re exposed to small amounts of radiation all the time — from cosmic rays to the normal radioactive decay of soil, rocks and building materials. Even the granite in the U.S. Capitol Building emits low levels of radiation. These levels are harmless, but a high dose can kill, and prolonged or repeated moderate exposure can lead to cancer.Continue reading…