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This study aims to investigate and optimize imaging sequences and parameters of rapid real-time MRI in order to obtain adequate guidance for accurately and precisely delivering radiation to moving abdominal and thoracic tumors.
Accurate dose delivery remains one of the weakest aspects of radiotherapy, especially in the case of thoracic and abdominal tumors, where significant patient motion occurs during dose delivery (intrafraction motion). Such motion results in geometric and dosimetric uncertainties that compromise treatment quality. Effective management of intrafraction motion is therefore key to realizing the full potential of modern image-guided radiation therapy (IGRT). While external markers have been found to be well-correlated with internal anatomy within an imaging session, there is no guarantee that these correlations will continue to exist and be constant throughout the course of the therapy. In general, implanted, radio-opaque seeds have been found to be more reliable than external markers. However, implantation of fiducials, whether radio-opaque or electromagnetic, is necessarily invasive and carries with it the risk of associated complications ─ an issue that becomes especially important for cancer patients with weakened immune systems. Currently, MR imaging is the only modality that is non-invasive and provides high quality volumetric information for the whole body.
The "ideal" intrafraction motion management requires complete spatio-temporal knowledge of the irradiated anatomy. However, to date, there is no clinical method of directly visualizing the tumor volume during dose delivery. Most techniques rely on external or internal surrogate markers which often provide (usually non-volumetric) information of limited accuracy and reliability. In addition, internal markers impose significant "costs" on the patient in terms of interventional complications and increased imaging dose. In this work, we investigate the feasibility of using in-room, fast cine MR imaging as a non-invasive means to provide real-time, soft-tissue-based, volumetric image guidance for continuous monitoring of the target and surrounding anatomy. To date, there has been no systematic investigation of the imaging requirements of an integrated MRI+linac for the specific task of real-time radiotherapy guidance.
Observational Model: Cohort, Time Perspective: Prospective
Stanford University School of Medicine
Published on BioPortfolio: 2014-07-23T21:10:23-0400
There is a need for better visualization of resection margins and detection of small tumor deposits during surgery for pancreatic cancer. Optical molecular imaging of pancreatic ductal ade...
The purpose of this research study is to see if a specific kind of MRI, called Superparamagnetic Iron Oxide Magnetic Resonance Imaging (SPIO MRI), which uses an FDA-approved contrast agent...
Patients with pancreatic cancer are treated with combinations of surgery, radiation therapy and chemotherapy, depending on the location of the cancer and other individual patient health fa...
The NFPTR was established in 1994 to find the causes of pancreatic cancer. In brief, the investigators are interested in both the genetic and non-genetic causes of pancreatic cancer. The i...
The main goal of this study is to explore the relationship between new-onset diabetes mellitus and a subsequent diagnosis of pancreatic cancer. Magnetic Resonance Imaging and Magnetic chol...
To correlate the overall survival (OS) with the imaging biomarkers of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), diffusion-weighted imaging (DWI), magnetic resonance spectroscopy,...
A diagnosis of pancreatic cancer in a first-degree relative increases an individuals' risk of this cancer. However, it is not clear whether this cancer risk increases in individuals with pancreatic cy...
Pancreatic cancer is the third leading cause of cancer death in the United States, and the 5-year relative survival for patients diagnosed with pancreatic cancer is less than 10%. Early intervention i...
Pancreatic cancer is still associated with a poor outcome and low patient quality of life, which are mainly attributed to the late detection and requirement of distal pancreatectomy with extended rese...
Pancreatic hamartoma is a rare benign malformation that resembles a neoplasm and may be mistaken for a malignancy. The imaging findings of pancreatic hamartoma are not well established, as only one ra...
The use of molecularly targeted imaging probes to localize and/or monitor biochemical and cellular processes via various imaging modalities that include RADIONUCLIDE IMAGING; ULTRASONOGRAPHY; MAGNETIC RESONANCE IMAGING; fluorescence imaging; and MICROSCOPY.
Tumors or cancer of the PANCREAS. Depending on the types of ISLET CELLS present in the tumors, various hormones can be secreted: GLUCAGON from PANCREATIC ALPHA CELLS; INSULIN from PANCREATIC BETA CELLS; and SOMATOSTATIN from the SOMATOSTATIN-SECRETING CELLS. Most are malignant except the insulin-producing tumors (INSULINOMA).
Star-shaped, myofibroblast-like cells located in the periacinar, perivascular, and periductal regions of the EXOCRINE PANCREAS. They play a key role in the pathobiology of FIBROSIS; PANCREATITIS; and PANCREATIC CANCER.
A 36-amino acid pancreatic hormone that is secreted mainly by endocrine cells found at the periphery of the ISLETS OF LANGERHANS and adjacent to cells containing SOMATOSTATIN and GLUCAGON. Pancreatic polypeptide (PP), when administered peripherally, can suppress gastric secretion, gastric emptying, pancreatic enzyme secretion, and appetite. A lack of pancreatic polypeptide (PP) has been associated with OBESITY in rats and mice.
Extracts prepared from pancreatic tissue that may contain the pancreatic enzymes or other specific uncharacterized factors or proteins with specific activities. PANCREATIN is a specific extract containing digestive enzymes and used to treat pancreatic insufficiency.
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...