Deep Learning Model Helps Detect Lung Tumors on CT

A new deep learning model shows promise in detecting and segmenting lung tumors, according to a study published in Radiology, a journal of the Radiological Society of North America (RSNA). The findings of the study could have important implications for lung cancer treatment.

According to the American Cancer Society, lung cancer is the second most common cancer among men and women in the U.S. and the leading cause of cancer death.

Accurate detection and segmentation of lung tumors on CT scans is critical for monitoring cancer progression, evaluating treatment responses and planning radiation therapy. Currently, experienced clinicians manually identify and segment lung tumors on medical images, a labor-intensive process that is subject to physician variability.

While artificial intelligence deep learning methods have been applied to lung tumor detection and segmentation, prior studies have been limited by small datasets, reliance on manual inputs, and a focus on segmenting single lung tumors, highlighting the need for models capable of robust and automated tumor delineation across diverse clinical settings.

In this study, a unique, large-scale dataset consisting of routinely collected pre-radiation treatment CT simulation scans and their associated clinical 3D segmentations was used to develop a near-expert-level lung tumor detection and segmentation model. The primary aim was to develop a model that accurately identifies and segments lung tumors on CT scans from different medical centers.

"To the best of our knowledge, our training dataset is the largest collection of CT scans and clinical tumor segmentations reported in the literature for constructing a lung tumor detection and segmentation model," said the study’s lead author, Mehr Kashyap, M.D., resident physician in the Department of Medicine at Stanford University School of Medicine in Stanford, California.

For the retrospective study, an ensemble 3D U-Net deep learning model was trained for lung tumor detection and segmentation using 1,504 CT scans with 1,828 segmented lung tumors. The model was then tested on 150 CT scans. Model-predicted tumor volumes were compared with physician-delineated volumes. Performance metrics included sensitivity, specificity, false positive rate and Dice similarity coefficient (DSC). DSC calculates the similarity between two sets of data by comparing the overlap between them. A value of 0 represents no overlap while a value of 1 represents perfect overlap. The model segmentations were compared to those from all three physician segmentations to generate the model-physician DSC values for each pairing.

The model achieved 92% sensitivity (92/100) and 82% specificity (41/50) in detecting lung tumors on the combined 150-CT scan test set.

For a subset of 100 CT scans with a single lung tumor each, the median model-physician and physician-physician segmentation DSCs were 0.77 and 0.80, respectively. Segmentation time was shorter for the model than for physicians.

Dr. Kashyap believes that the use of a 3D U-Net architecture in developing the model provides an advantage over approaches using a 2D architecture.

"By capturing rich interslice information, our 3D model is theoretically capable of identifying smaller lesions that 2D models may be unable to distinguish from structures such as blood vessels and airways," he said.

One limitation of the model was its tendency to underestimate tumor volume, resulting in poorer performance on very large tumors. Because of this, Dr. Kashyap cautions that the model should be implemented in a physician-supervised workflow, allowing clinicians to identify and discard incorrectly identified lesions and lower-quality segmentations.

The researchers suggest that future research should focus on applying the model to estimate total lung tumor burden and evaluate treatment response over time, comparing it to existing methods. They also recommend assessing the model’s ability to predict clinical outcomes on the basis of estimated tumor burden, particularly when combined with other prognostic models using diverse clinical data.

"Our study represents an important step toward automating lung tumor identification and segmentation," Dr. Kashyap said. "This approach could have wide-ranging implications, including its incorporation in automated treatment planning, tumor burden quantification, treatment response assessment and other radiomic applications."

Kashyap M, Wang X, Panjwani N, Hasan M, Zhang Q, Huang C, Bush K, Chin A, Vitzthum LK, Dong P, Zaky S, Loo BW, Diehn M, Xing L, Li R, Gensheimer MF.
Automated Deep Learning-Based Detection and Segmentation of Lung Tumors at CT.
Radiology. 2025 Jan;314(1):e233029. doi: 10.1148/radiol.233029

Most Popular Now

Unlocking the 10 Year Health Plan

The government's plan for the NHS is a huge document. Jane Stephenson, chief executive of SPARK TSL, argues the key to unlocking its digital ambitions is to consider what it...

Alcidion Grows Top Talent in the UK, wit…

Alcidion has today announced the addition of three new appointments to their UK-based team, with one internal promotion and two external recruits. Dr Paul Deffley has been announced as the...

AI can Find Cancer Pathologists Miss

Men assessed as healthy after a pathologist analyses their tissue sample may still have an early form of prostate cancer. Using AI, researchers at Uppsala University have been able to...

AI, Full Automation could Expand Artific…

Automated insulin delivery (AID) systems such as the UVA Health-developed artificial pancreas could help more type 1 diabetes patients if the devices become fully automated, according to a new review...

How AI could Speed the Development of RN…

Using artificial intelligence (AI), MIT researchers have come up with a new way to design nanoparticles that can more efficiently deliver RNA vaccines and other types of RNA therapies. After training...

MIT Researchers Use Generative AI to Des…

With help from artificial intelligence, MIT researchers have designed novel antibiotics that can combat two hard-to-treat infections: drug-resistant Neisseria gonorrhoeae and multi-drug-resistant Staphylococcus aureus (MRSA). Using generative AI algorithms, the research...

AI Hybrid Strategy Improves Mammogram In…

A hybrid reading strategy for screening mammography, developed by Dutch researchers and deployed retrospectively to more than 40,000 exams, reduced radiologist workload by 38% without changing recall or cancer detection...

Penn Developed AI Tools and Datasets Hel…

Doctors treating kidney disease have long depended on trial-and-error to find the best therapies for individual patients. Now, new artificial intelligence (AI) tools developed by researchers in the Perelman School...

New Training Year Starts at Siemens Heal…

In September, 197 school graduates will start their vocational training or dual studies in Germany at Siemens Healthineers. 117 apprentices and 80 dual students will begin their careers at Siemens...

Are You Eligible for a Clinical Trial? C…

A new study in the academic journal Machine Learning: Health discovers that ChatGPT can accelerate patient screening for clinical trials, showing promise in reducing delays and improving trial success rates. Researchers...

New AI Tool Addresses Accuracy and Fairn…

A team of researchers at the Icahn School of Medicine at Mount Sinai has developed a new method to identify and reduce biases in datasets used to train machine-learning algorithms...

Global Study Reveals How Patients View M…

How physicians feel about artificial intelligence (AI) in medicine has been studied many times. But what do patients think? A team led by researchers at the Technical University of Munich...