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Ashmeet Gill had her first PET/CT scan shortly after being diagnosed with Hodgkin’s lymphoma, a cancer of the body’s germ-fighting immune system. She was nervous. Claustrophobia is an issue for the young Stratford resident and the scan, necessary to determine if the cancer had spread beyond the lymph nodes in her neck, would take 34 to 45 minutes, she was told.

Wrapped in a sheet and tucked inside the tube of the PET/CT at St. Joseph’s Health Care London (St. Joseph’s), Ashmeet, then 24, steeled herself to remain calm. But near the end of the scan, a sense of panic set in.

“It was not pleasant but I endured it. I made it through.”

Ashmeet’s next PET/CT scan would be six months later, after six cycles of chemotherapy, to determine if the treatment had worked. She was terrified of another panic episode. By then, however, St. Joseph’s had a brand-new PET/CT – Canada’s first, next generation, state-of-the-art Omni Legend PET/CT from GE HealthCare.

This time, Ashmeet’s scan took “barely 15 minutes or so,” she recalled.

“I thought, seriously? I couldn’t believe I was done. I was so happy.”

With the very first patients scanned with St. Joseph’s new PET/CT machine, it was obvious the breakthrough technology was living up to high expectations.

The machine is fast – decreasing the time it took for a scan from about 45 minutes on the older system to less than 14 – head to toe. Patients are exposed to less radiation, and the ability to precisely detect disease and tiny abnormalities is outstanding.

“This is what we have been waiting for,” says Ting-Yim Lee, a pioneer in the use of machines like PET/CT to gather new, vital information about diseases. “St. Joseph’s new Omni Legend by GE HealthCare is answering the call for patients, clinicians and researchers alike.”

PET/CT is the medical ace in imaging for the assessment and treatment monitoring of cancer, neurodegenerative disorders, and metabolic and cardiovascular diseases. At St. Joseph’s, the possibilities of this technology took a giant leap forward in August 2023, thanks in part to the generosity of donors and a $1 million contribution from St. Joseph’s Health Care Foundation. With the arrival of the new system, St. Joseph’s is set to become Canada’s first national GE HealthCare centre of excellence in molecular imaging and theranostics. This two-pronged approach to diagnosing and treating cancers and other diseases merges molecular imaging with the use of radiopharmaceuticals to identify the location and extent of diseased tissues and selectively destroy the abnormal cells.

“The speed at which we can now do exams means significantly improved comfort for patients while the exceptional image quality changes the game in the hunt for cancerous lesions,” explains Ting, Director of PET/CT Research at Lawson Health Research Institute (Lawson) and medical physicist at St. Joseph’s Hospital.

“For young adults undergoing repeat PET/CT exams due to their medical conditions, managing the radiation dose is critical,” explains Dr. Narinder Paul, Lawson scientist and Chief, Medical Imaging, at St. Joseph’s. “These individuals already face an elevated life-time risk of developing cancer from radiation, and this risk further increases with additional exposures.”

For older adults, the time it takes for the examination is also of great concern. Lying still for long periods can be a hardship due to pain from bone metastases or other conditions, and is a challenge for those who have dementia, are claustrophobic or experiencing other issues, adds Dr. Paul.

“Reducing the exam time is a huge improvement in the patient experience for these individuals.”

While patients hail the new PET/CT experience, clinicians and scientists are raving about the machine’s imaging prowess. The advanced AI-driven image formation technology now empowers the precise detection of cancer within lymph nodes and other anatomical structures, “achieving remarkable accuracy even for very small lesions,” says Dr. Paul.

“The advantages we have seen so far are already impressive but what’s on the horizon in research and care – what we will be able to study and do – is even more exciting,” says Ting.

In particular, the new PET/CT is expected to be the catalyst for ground-breaking clinical research for patients facing breast cancer, Alzheimer’s disease, prostate cancer, epilepsy and obesity. Scientific exploration in these areas is currently being planned at St. Joseph’s that will pave the way for novel treatments, new, non-invasive ways to identify a patient’s risk of disease, the potential to clearly and painlessly view how treatment is working, and the ability to uncover the tiniest abnormalities at play when it comes to diseases and conditions.

St. Joseph’s Health Care London’s 2016-2017 Annual Report features stories of care, recovery, discovery, teaching and resiliency – of care teams, patients, residents, and their families.

Included in the 2016-2017 Annual Report are the following research stories:

• New imaging research chairs make history: In a historical-first, St. Joseph’s Health Care Foundation and Western University announced two research chairs to advance imaging research at Western University and Lawson Health Research Institute. The research chairs have been named after the two scientists who are revolutionizing health care through their groundbreaking imaging research – Drs. Ting-Yim Lee and Frank Prato.
• A world-first approach to dementia: Researchers at Lawson Health Research Institute are the first in the world conducting a clinical trial to test a triple intervention aimed at treating mild cognitive impairment (MCI) and delaying the onset of dementia. The Mobility, Exercise and Cognition (MEC) team will be incorporating physical exercises, cognitive training and vitamin D supplementation to determine the best treatment for improving mobility and cognition.
• First clinical guidelines in Canada for pain following spinal cord injury: Researchers at Lawson Health Research Institute are the first in Canada to develop clinical practice guidelines that address the unique challenges for managing pain during recovery and rehabilitation from spinal cord injury.
• CAHO HWS field trip to Lawson: The Council of Academic Hospitals of Ontario (CAHO) toured the labs of Lawson Health Research Institute to encourage stable investment in hospital-based research and showcase the groundbreaking work underway at St. Joseph’s and London Health Sciences Centre.
• iSee Vision Screening Research Program: iSee, an innovative vision screening research program of St. Joseph’s Ivey Eye Institute is catching problems early for children ages 18 months to five years. The screening, which takes only seconds, detects amblyopia (lazy eye) and other eye conditions that can cause poor vision

Dr. Blayne Welk, a urologist at St. Joseph’s Health Care London, noticed that some of his patients were experiencing depression and other issues following complications related to pelvic mesh-based slings.

“A lot of patients were very emotional telling their story,” notes Dr. Welk.

“They told me about a lot of frustrations related to treatment options for complications. A lot of patients manage for years with problems and didn’t know the source of the issue, or that there is something that can be done to address it. Unfortunately, there are some cases where we can’t fix all the complications, but there are things that we can do to improve the situation. I think a lot of women get frustrated along the journey of finding that solution.” 

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Women with stress urinary incontinence leak urine when they cough, sneeze, laugh or are physically active. Mesh slings are made of synthetic polypropylene, a type of plastic, which are surgically implanted in the vaginal wall to treat urinary leakage. Mesh-based incontinence slings account for more than 90 per cent of incontinence procedures in women, and are associated with uncommon but potentially significant complications.

Dr. Welk is also an adjunct scientist with ICES, associate scientist at Lawson Health Research Institute and assistant professor at Western University’s Schulich School of Medicine & Dentistry. Following his observations in the clinic, he led a research project to study the impact of the complications some women were facing. 

“There have been regulatory warnings and lawsuits related to significant transvaginal mesh complications. We wanted to quantify the serious psychological complications that can occur in women as a result of complications from transvaginal midurethral slings,” said Dr. Welk.

Complications are rare but when they happen they can be difficult and challenging to fix, as well as quite impactful for patient lives. They can experience chronic pain, new or changing urinary symptoms and erosions where some of the mesh becomes exposed in surrounding tissue. 

To determine whether women who experience midurethral sling mesh complications requiring surgical intervention have an increased risk of depression or self-harm behaviour, Welk's team tracked the number of Ontario women who needed a follow-up surgery to remove or fix a mesh implant and if they received treatment for depression or self-harm. The study, published in the journal JAMA Surgery, included almost 60,000 women who had the procedure January 2004 through December 2015.

The researchers found that 2. 8 per cent (1586 women) underwent a surgical procedure for a mesh complication. Of those women, 11 per cent (175 women) were treated for depression compared to eight per cent of women (4,470) who didn’t have corrective surgery. Of the women who needed corrective surgery, 2.77 per cent of women suffered from self-harm behaviour compared to only 1.15 per cent of women who did not need corrective surgery. These risks were highest in younger women, in particular those 46 years old and younger.

“Younger women are the ones who are most at risk of these mental health complications. We suspect that’s because of a stronger negative association between the complications and intimacy among this age group. They are also more likely to still be working full-time and raising children.”

The study reinforces some of the consequences that can occur from slings, and that those can be quite serious. 

“It is important to note that a lot of women are going into these operations to improve their quality of life. It’s not necessarily a dangerous condition when you have stress incontinence. There is a decision made to treat it. I think that in those rare cases when someone does experience severe complications, it can lead to decisional regret.”

There is often not an easy solution, with patients often requiring multiple different therapies to address the complications. This can include pain management, surgery, consultations with pain specialists and psychological support along the way. In some cases, removing the mesh does not resolve the pain and it can be very difficult to identify which individuals will benefit from what therapy, including surgery, notes Dr. Welk. 

The researchers add that when women experience midurethral sling complications, both they and their surgeons should be aware of the potential serious psychological impact of these complications.

The article “Midurethral sling complications and the risk of new onset depression or self-harm” is published in JAMA Surgery.

Author block: Blayne Welk, Jennifer Reid, Erin Kelly, You (Maria) Wu.