Publications by authors named "DR Johnson"

This joint practice guideline/procedure standard was collaboratively developed by the European Association of Nuclear Medicine (EANM), the Society of Nuclear Medicine and Molecular Imaging (SNMMI), the European Association of Neuro-Oncology (EANO), and the PET task force of the Response Assessment in Neurooncology Working Group (PET/RANO). Brain metastases are the most common malignant central nervous system (CNS) tumors. PET imaging with radiolabeled amino acids and to lesser extent [F]FDG has gained considerable importance in the assessment of brain metastases, especially for the differential diagnosis between recurrent metastases and treatment-related changes which remains a limitation using conventional MRI.

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Adult primary leptomeningeal gliomatosis (PLG) is a rare, rapidly progressive and fatal disease characterized by prominent leptomeningeal infiltration by a glial tumor without an identifiable parenchymal mass. The molecular profile of adult PLG has not been well-characterized. We report the clinical, pathological, and molecular findings of six adult PLG patients (five males and one female), median age 58 years.

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Background And Purpose: Pituitary microadenomas can be challenging to see on MRI, particularly when they are small. The detection of microadenomas commonly relies on contrast-enhanced sequences, highlighting the adenoma that demonstrates hypoenhancement relative to the native pituitary on T1-weighted sequences. Detecting adenomas in patients with Cushing disease is crucial, as surgery is the standard of care treatment.

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Cancer patients experience pain at significant rates but are often undertreated-it is estimated that less than 1% of eligible cancer pain patients receive appropriate targeted drug delivery to address their pain. Cancer pain is often managed with systemic opioid treatment; however, this approach is limited in treating pain adequately and carries significant side effect risk profiles. Successful treatment of pain is closely tied to better oncologic outcomes as well as better measures on assessments of quality of life for cancer patients.

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Radioligand therapies such as [Lu] Lu-PSMA-617 have gained significant momentum in cancer treatment after clinical trials and multicenter studies demonstrated their safety and efficacy. As these innovative treatments become more widespread, rare and unique clinical manifestations are expected to be observed. In this report, we describe a case with metastatic castration-resistant prostate cancer (mCRPC) and peripancreatic lymph node metastases who developed acute pancreatitis following [Lu] Lu-PSMA-617 therapy.

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  • - The study investigated the safety and feasibility of a new spinal electrical stimulation technology called RISES, which allows real-time adjustments to stimulation settings while collecting various data.
  • - Four participants with spinal cord injuries (SCIs) were tested, and results showed no serious adverse effects, with stable skin integrity, vital signs, and pain levels; however, fatigue increased post-stimulation.
  • - The trial compared open-loop and closed-loop stimulation methods, finding that while open-loop sessions had longer stimulation durations, there were no significant differences in setup time or other health measures between the two methods.
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  • The study examines the low tumor doses achieved in non-prostate cancers treated with [Lu]Lu-PSMA radioligand, using a case of renal cell carcinoma as an example.
  • Despite high uptake of the imaging agent [Ga]Ga-PSMA-11, treatment with [Lu]Lu-PSMA-I&T resulted in low radiation doses to tumors (0.2-0.5 Gy) and no observable treatment effect.
  • The researchers suggest that the ineffective targeting may be due to PSMA receptors being located on new blood vessels rather than on tumor cells, leading to rapid washout; they propose using a radionuclide with a shorter half-life to improve treatment efficacy.
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  • The gastrin-releasing peptide receptor (GRPr) is being studied as a potential diagnostic and therapeutic target for various cancers, particularly in detecting intra-prostatic prostate cancer (PCa) lesions using [Ga] Ga-GRPr PET imaging.
  • A systematic review analyzed data from 9 studies with 291 patients, finding that [Ga] Ga-GRPr PET imaging had detection rates of 87.09% for overall patients and 89.01% for those with Gleason scores of 7 or higher, while per-lesion detection rates were 78.54%.
  • The detection rate for multiparametric MRI (mpMRI) was slightly higher at 91.85%, but the difference compared to [Ga
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Objective: Visual assessments of amyloid-β PET, used for Alzheimer's disease (AD) diagnosis and treatment evaluation, require a careful approach when different PET ligands are utilized. Because the gray matter (GM) and white matter (WM) ligand bindings vary with age, the objective was to investigate the agreement between visual reads of 11 C- and 18 F-PET scans.

Methods: Cognitively unimpaired (CU) younger adults ( N  =   30; 39.

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Surface-associated microbial systems are hotspots for the spread of plasmid-encoded antibiotic resistance, but how surface association affects plasmid transfer and proliferation remains unclear. Surface association enables prolonged spatial proximities between different populations, which promotes plasmid transfer between them. However, surface association also fosters strong metabolic interactions between different populations, which can direct their spatial self-organization with consequences for plasmid transfer and proliferation.

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Treatment with Lu-prostate-specific membrane antigen (PSMA)-617 (Lu-vipivotide tetraxetan [Pluvicto]) prolongs both progression-free and overall survival in advanced PSMA-positive metastatic castration-resistant prostate cancer. Data examining specifically neurologic symptoms after Lu-PSMA-617 treatment are scarce. In this study, we aimed to review the neurologic findings in a large cohort of metastatic castration-resistant prostate cancer patients undergoing Lu-PSMA-617 therapy.

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Background: Many patients use artificial intelligence (AI) chatbots as a rapid source of health information. This raises important questions about the reliability and effectiveness of AI chatbots in delivering accurate and understandable information.

Purpose: To evaluate and compare the accuracy, conciseness, and readability of responses from OpenAI ChatGPT-4 and Google Bard to patient inquiries concerning the novel Lu-PSMA-617 therapy for prostate cancer.

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This study used data from the National Longitudinal Transition Study 2012 (NLTS 2012) to explore the future goal aspirations of students with extensive support needs who participate in alternate assessments, compared to other students with extensive support needs and to students with other disabilities. We examined students' individualized education program (IEP)/transition planning meeting experiences and postschool goals in relation to their functional, communication, and self-advocacy skills, as well as their school/community support. Students with other disabilities held higher expectations than all students with extensive support needs for future participation in postsecondary education, employment, independent living, and financial independence.

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Phage predation is generally assumed to reduce microbial proliferation while not contributing to the spread of antibiotic resistance. However, this assumption does not consider the effect of phage predation on the spatial organization of different microbial populations. Here, we show that phage predation can increase the spread of plasmid-encoded antibiotic resistance during surface-associated microbial growth by reshaping spatial organization.

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Purpose: To provide practice guideline/procedure standards for diagnostics and therapy (theranostics) of meningiomas using radiolabeled somatostatin receptor (SSTR) ligands.

Methods: This joint practice guideline/procedure standard was collaboratively developed by the European Association of Nuclear Medicine (EANM), the Society of Nuclear Medicine and Molecular Imaging (SNMMI), the European Association of Neurooncology (EANO), and the PET task force of the Response Assessment in Neurooncology Working Group (PET/RANO).

Results: Positron emission tomography (PET) using somatostatin receptor (SSTR) ligands can detect meningioma tissue with high sensitivity and specificity and may provide clinically relevant information beyond that obtained from structural magnetic resonance imaging (MRI) or computed tomography (CT) imaging alone.

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Objectives: To assess whether increasing levels of hospital stress-measured by intensive care unit (ICU) bed occupancy (primary), ventilators in use and emergency department (ED) overflow-were associated with decreasing COVID-19 ICU patient survival in Colorado ICUs during the pre-Delta, Delta and Omicron variant eras.

Design: A retrospective cohort study using discrete-time survival models, fit with generalised estimating equations.

Setting: 34 hospital systems in Colorado, USA, with the highest patient volume ICUs during the COVID-19 pandemic.

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Meningiomas are the most common intracranial neoplasms in adults. While most meningiomas are cured by resection, further treatment by radiotherapy may be needed, particularly in WHO grades 2 and 3 tumors which have an increased risk of recurrence, even after conventional therapies. Still, there is an urgent need for novel therapeutic strategies after the exhaustion of local treatment approaches.

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Antiamyloid therapies for Alzheimer disease recently entered clinical practice, making imaging biomarkers for Alzheimer disease even more relevant to guiding patient management. Amyloid and tau PET are valuable tools that can provide objective evidence of Alzheimer pathophysiology in living patients and will increasingly be used to complement F-FDG PET in the diagnostic evaluation of cognitive impairment and dementia. Parkinsonian syndromes, also common causes of dementia, can likewise be evaluated with a PET imaging biomarker,F-DOPA, allowing in vivo assessment of the presynaptic dopaminergic neurons.

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Dilated perivascular spaces (PVSs) are common and easily recognized on imaging. However, rarer giant tumefactive PVSs (GTPVSs) can have unusual multilocular cystic configurations, and are often confused for other pathologic entities, including neoplasms, cystic infarctions, and neuroepithelial cysts. Because GTPVSs are scarcely encountered and even more infrequently operated upon, many radiologists are unaware of the imaging and pathologic features of these lesions.

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Using National Longitudinal Transition Study 2012 data, this study explored parent and youth expectations in the areas of postsecondary education, employment, independent living, and financial independence. Compared to youth with other disabilities, youth with intellectual and developmental disabilities and their parents had much lower expectations for the four postschool goals, and parent expectations were much lower than youth's own expectations. Also, youth's race, along with their daily living skills and functional abilities, were positively associated with parent and youth expectations in several future goal areas.

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Background And Purpose: Cushing disease is typically caused by a pituitary adenoma that frequently is small and challenging to detect on conventional MR imaging. High-field-strength 7T MR imaging can leverage increased SNR and contrast-to-noise ratios compared with lower-field-strength MR imaging to help identify small pituitary lesions. We aimed to describe our institutional experience with 7T MR imaging in patients with Cushing disease and perform a review of the literature.

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Historically, MR imaging has been unable to detect a pituitary adenoma in up to one-half of patients with Cushing disease. This issue is problematic because the standard-of-care treatment is surgical resection, and its success is correlated with finding the tumor on imaging. Photon-counting detector CT is a recent advancement that has multiple benefits over conventional energy-integrating detector CT.

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Measles virus (MV) vaccine strains have shown significant preclinical antitumor activity against glioblastoma (GBM), the most lethal glioma histology. In this first in human trial (NCT00390299), a carcinoembryonic antigen-expressing oncolytic measles virus derivative (MV-CEA), was administered in recurrent GBM patients either at the resection cavity (Group A), or, intratumorally on day 1, followed by a second dose administered in the resection cavity after tumor resection on day 5 (Group B). A total of 22 patients received study treatment, 9 in Group A and 13 in Group B.

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