Block matching sparsity regularization-based image reconstruction for incomplete projection data in computed tomography.

Block matching sparsity regularization-based image reconstruction for incomplete projection data in computed tomography. Phys Med Biol. 2017 Nov 30;: Authors: Cai A, Li L, Zheng Z, Zhang H, Wang L, Hu G, Yan B Abstract In medical imaging fields, many of the conventional regularization meth-ods, such as total variation or total generalized variation, impose strong prior assumptions on images which can only account for very limited classes of im-ages. A more reasonable sparse representation frame for images is still in strong need. Visually understandable images contain meaningful patterns and the combinations or collections of these patterns can be utilized to form some sparse and redundant representations which can promisingly facilitate image reconstructions. In this work, we propose and study the block matching spar-sity regularization (BMSR) and devise the optimization program using BMSR for computed tomography (CT) image reconstruction for incomplete projec-tion set. The program is built as a constrained optimization, minimizing the L1-norm of the coefficients of the image in the transformed domain subject to the data observation and positivity of image itself. To solve the program effi-ciently, a practical algorithm based on the proximal point algorithm is devel-oped and analyzed. In order to accelerate the convergence rate, a practical strategy for tuning the BMSR parameter is proposed and applied. The experi-mental results of various settings, inc...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research

Related Links:

In conclusion, a novel yet reliable method for the measurement of intracellular 18F-FDG via GS has been developed, and our results indicate that 18F-FDG uptake is associated with radiation and cetuximab response in HNSCC. PMID: 31620196 [PubMed]
Source: Oncology Letters - Category: Cancer & Oncology Tags: Oncol Lett Source Type: research
We present unusual treatment outcome in a 59-year-old male diagnosed with metastatic lung adenocarcinoma with a very good response to ruxolitinib as monotherapy. In June 2017, this patient was diagnosed with myeloproliferative neoplasm – Janus-associated kinases 2 positive – and in December 2017 ruxolitinib therapy was started. At the same time, patient was diagnosed with lung adenocarcinoma in the left lower lobe with positive anaplastic lymphoma kinase mutation and with right lower lobe metastasis. Because of partial regression of tumor size noted on the computed tomography (CT) scans during tumor investigati...
Source: Anti-Cancer Drugs - Category: Cancer & Oncology Tags: Case Reports Source Type: research
We describe a case involving a 67-year-old ovarian cancer patient who underwent multiple lines of chemotherapy and presented with recurrent disease and a CA-125 of 4112 U/mL. Thenceforth, she was treated with GL-ONC1 oncolytic viral therapy that was administered laparoscopically in accordance with a clinical trial. The patient subsequently received chemotherapy and during the fourth cycle, her CA-125 decreased to 99 U/mL; moreover, a computed tomography scan of the pelvis exhibited significant disease reduction. Viral therapy hypothetically confers significant promise in the treatment of recurrent ovarian cancer, especiall...
Source: Anti-Cancer Drugs - Category: Cancer & Oncology Tags: Case Reports Source Type: research
ConclusionA high index of suspicion should be held if pain is disproportionate to the signs or sepsis is present. To aid an early diagnosis, imaging of the breast should be performed early to avoid delay in treatment.
Source: International Journal of Surgery Case Reports - Category: Surgery Source Type: research
ConclusionLaparoscopic surgery is effective, even for this rare abdominal emergency. Moreover, laparoscopy-assisted surgery accompanying mini-laparotomy is a rational treatment approach, especially for this condition.
Source: International Journal of Surgery Case Reports - Category: Surgery Source Type: research
ConclusionMAC arising at a hand may require wider excision in order to achieve best result. Although this malignancy is a slowly progressive disease, distant metastasis should always be concerned, especially when there are suspicious presentations. CT scan will render more details and make more precise diagnosis in the suspicious situation.
Source: International Journal of Surgery Case Reports - Category: Surgery Source Type: research
ConclusionThe use of an ipsilateral NSF for the transpterygoid management of temporo-sphenoidal meningoceles, although more complex, allows a better coverage of the defect, compared to the contralateral NSF, which is not long enough in 42% of cases.
Source: European Annals of Otorhinolaryngology, Head and Neck Diseases - Category: ENT & OMF Source Type: research
ConclusionsThe macrolide antibiotics treatment has beneficial effects on lung function in non-asthmatic chronic cough patients with normal chest X-ray findings. The improvement of chronic rhinosinusitis may have some role in the lung condition. Upper respiratory tract examination and treatment may be useful for the management of chronic cough.
Source: American Journal of Otolaryngology - Category: Endocrinology Source Type: research
We present images of 177Lu-DOTATATE scan and 68Ga-DOTATATE PET/CT scan conducted on a 65-year-old man with prostate cancer with neuroendocrine differentiation, whose disease progressed despite conventional treatment and 177Lu-PSMA radioligand therapy; however, an extraordinary radiographic tumor remission, biochemical response, and improvement of clinical symptoms were observed after the patient underwent 177Lu-DOTATATE peptide receptor radionuclide therapy.
Source: Clinical Nuclear Medicine - Category: Nuclear Medicine Tags: Interesting Images Source Type: research
We present a case of a 22-year-old woman with ectopic ACTH-dependent Cushing syndrome due to an appendicular carcinoid, which was localized with the help of 68Ga-DOTATATE PET/CT scan.
Source: Clinical Nuclear Medicine - Category: Nuclear Medicine Tags: Interesting Images Source Type: research
More News: Biology | CT Scan | Men | PET Scan | Physics | Study