Cancer Clinical Trial
Official title:
Photoacoustic Tomography of Normal and Abnormal Vasculature: Feasibility of in Vivo Measurements.
Cancer is one of the leading causes of death internationally. When planning treatment for most cancers, it is important to know how far it has spread, including whether or not the cancer has spread to the local lymph nodes (LNs) because this affects the treatment strategy. This is termed "staging", and can be achieved by medical imaging, such as by ultrasound, computed tomography (CT) or magnetic resonance imaging (MRI) scans. However, these are imperfect, and sometimes incorrect treatment decisions are made because of errors in staging by imaging. Improved accuracy would be of great clinical value for almost all solid organ tumours. An emerging technique to address this is photoacoustic tomography (PAT), a non-invasive, safe modality that relies on light and sound to generate images. Laser light is applied to the area to be imaged; this is absorbed, and causes the illuminated tissue to emit ultrasound waves. These can be detected and turned into an image by post-processing techniques similar to those used in conventional diagnostic ultrasound. By changing the wavelength of light used, the technique can be adjusted to optimise detection of various body components, including fat, water and both oxygenated and deoxygenated blood. This means the images can represent tissue composition and function rather than just anatomical structure. Hitherto, most work on PAT has been on healthy volunteers, and has focused on imaging the vasculature. We would like to see whether we are able to generate images of deeper structures inside the body. Initially we will focus on patients with vascular disease, whom we expect to have abnormal blood vessels; and subsequently we will attempt to image tumours and LNs in patients with cancer.
Status | Recruiting |
Enrollment | 27 |
Est. completion date | November 1, 2018 |
Est. primary completion date | November 1, 2018 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years and older |
Eligibility |
Peripheral vascular disease: Inclusion Criteria: - Adults (aged over 18 years) - Suspected or proven to have peripheral arterial or venous disease on the basis of physical examination, imaging or ankle-brachial pressure index. - Able to provide informed consent Exclusion Criteria: - Aged 17 or under - Unable to provide informed consent (e.g. due to dementia or severe mental illness) - Skin condition precluding safe and/or comfortable placement of an ultrasound or PAT probe (e.g. active infection, ulcerating tumour) Oncology Cohort All adult patients with either (a) superficial primary tumours or (b) solid organ tumours with a propensity to spread to superficial lymph nodes will be potentially eligible. These include head and neck cancers, breast cancers, skin cancers including melanoma, low rectal and anal cancer, lung cancer and cancers of the upper gastrointestinal tract. - Adults (aged over 18 years) - have either a proven diagnosis of malignancy or be under active investigation for malignant disease. - Able to provide informed consent |
Country | Name | City | State |
---|---|---|---|
United Kingdom | University College London Hospital | London |
Lead Sponsor | Collaborator |
---|---|
University College, London |
United Kingdom,
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Guggenheim JA, Allen TJ, Plumb A, Zhang EZ, Rodriguez-Justo M, Punwani S, Beard PC. Photoacoustic imaging of human lymph nodes with endogenous lipid and hemoglobin contrast. J Biomed Opt. 2015 May;20(5):50504. doi: 10.1117/1.JBO.20.5.050504. — View Citation
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Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | The proportion of PAT acquisitions in which the target lymph node is visible, as judged by the mean of both readers' qualitative scores | Mean score of 2 or above | 1 year | |
Secondary | Dimension of smallest blood vessels resolvable by PAT | Using full-width at half maximum, FWHM, to define the margins of a resolvable vessel | 1 year |
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