Somatostatin receptor-targeted alpha radionuclide therapies have been introduced including actinium-225 labeled tetraazacyclododecanetetraacetic acid-octreotide (Ac-225 DOTATATE) for advanced metastatic neuroendocrine tumors (NET). Very limited data are available on the posttherapy imaging using Ac-225 DOTATATE therapy in metastatic NET. We present Ac-225 single-photon emission computed tomography/computed tomography images of a 72-year-old patient diagnosed as a case of advanced rectal NET treated primarily with Ac-225 DOTATATE.Melioidosis is an emerging infectious disease in India. The disease has a crippling effect on the patient owing to its widespread dissemination and complications post bacteremia. The role of 18-fluorine-fluorodeoxyglucose (FDG) positron emission tomography-computed tomography (PET-CT) is becoming increasingly important in terms of documenting the extent of disease and response to treatment. Herein, we present cases of two patients who were referred for a whole-body 18F-FDG PET-CT scan with a history of long-standing fever that went undiagnosed. 18F-FDG PET-CT scan was performed to evaluate pyrexia of unknown origin. A conclusion was reached after blood culture which showed the growth of Burkholderia pseudomallei - which is considered to be the cause of this rare but debilitating disease.
The objective is to investigate psychological status and quality of life (QoL) using Hospital Anxiety and Depression Scale (HADS) and Short-Form (36) Health Survey (SF-36) questionnaires in patients with proven differentiated thyroid cancer (DTC) who are referred for radioactive iodine (RAI) ablation before, during, and after treatment.
Of patients who underwent total thyroidectomy with a pathologically proven DTC (papillary and follicular types) referred for RAI treatment to our department in 2018, 150, in whom the diagnosis was newly established, were referred for the first course of RAI treatment and were consecutively enrolled in the study. The patients received an oral dose of radioiodine (3700 or 5550 MBq). For evaluation of anxiety, depression, and QoL, all patients are given two standard questionnaires, HADS, and SF-36 and are requested to answer them at four time points. First one was at 1 month before RAI, second was at the time of RAI treatment. Third and fourth ones were 1 week and 6 months latric intervention.
Trend in scores over several-months' time discloses gradual improvement of QoL and merits close observation but limited psychiatric intervention.
In single-photon emission computed tomography imaging, the presence of scatter degrades image quality. The goal of this study is to optimize the main- and sub-energy windows for triple-energy window (TEW) method using Monte Carlo SImulating Medical Imaging Nuclear Detectors (SIMIND) code for samarium-153 (Sm-153) imaging.
The comparison is based on the Monte Carlo simulation data with the results estimated using TEW method. Siemens Symbia gamma-camera equipped with low-energy high-resolution collimator was simulated for Sm-153 point source located in seven positions in water cylindrical phantom. Three different main-energy window widths (10%, 15%, and 20%) and three different sub-energy window widths (2, 4, and 6 keV) were evaluated. We compared the true scatter fraction determined by SIMIND and scatter fraction estimated using TEW scatter correction method at each position. In order to evaluate the image quality, we used the full width at half maximum (FWHM) computed on the PSF and image contrast using Jaszczak phantom.
The scatter fraction using TEW method is similar to the true scatter fraction for 20% of the main-energy window and 6 keV sub-energy windows. For these windows, the results show that the resolution and contrast were improved.
TEW method could be a useful scatter correction method to remove the scatter event in the image for Sm-153 imaging.
TEW method could be a useful scatter correction method to remove the scatter event in the image for Sm-153 imaging.
F-Fluorodeoxyglucose positron emission tomography/computed tomography (
F-FDG PET/CT) is used in the management of recurrent differentiated thyroid cancer (DTC) patients presented with rising thyroglobulin (Tg) or anti-Tg antibody (Atg) levels and negative whole-body I-131 scan (WBS). We aimed to evaluate the utility of regional or limited PET/CT in a large population preset with variable Tg/(ATg) levels.
In a retrospective study, we analyzed 137 PET/CT done on DTC patients presented with raised Tg/Atg and negative WBS. https://www.selleckchem.com/products/Atazanavir.html Retrospective evaluation of other available clinical information was done.
One hundred and thirty-seven patients aged 8-72 years (41 ± 17.7 years) were included in the study. Eighty-nine (64.9%) patients had positive findings on
F-FDG PET-CT. It included thyroid bed recurrence, cervical, mediastinal lymphadenopathy, lung, and bone lesions. In addition, 36 patients had metabolically inactive lung nodules detected on CT. Serum Tg and female sex were the only predictors for a positive PET scan. In most (97.1%) of the patients, the disease was limited to the neck and thoracic region.
PET/CT is an excellent imaging modality for evaluating DTC patients presented with biochemical recurrence. It not only finds the disease in more than 80% of the patients but also detects distant metastatic disease, which precludes regional therapies. Lesions were noted mostly in the neck and thoracic region with very few distant skeletal metastases (4/137 patients). In most of the patients, routine vertex to mid-thigh imaging could be avoided.
PET/CT is an excellent imaging modality for evaluating DTC patients presented with biochemical recurrence. It not only finds the disease in more than 80% of the patients but also detects distant metastatic disease, which precludes regional therapies. Lesions were noted mostly in the neck and thoracic region with very few distant skeletal metastases (4/137 patients). In most of the patients, routine vertex to mid-thigh imaging could be avoided.The growth of diagnostic nuclear medicine is substantially based on the development, availability, and regular clinical use of cyclotron-based positron emission tomography (PET) tracers. Apart from 18F (110 min) products, the radiometal 68Ga isotope (68 min) has found an increasingly wide clinical acceptance. There is hence much merit in identifying and fostering other radiometal positron emitters, of preferably longer half-life. Titanium-45 (3.08 h) fits the bill well in this context, as it is easy to produce using natural scandium metal target and Ep of 13-14 MeV for 45Sc(p, n) 45Ti reaction. This Commentary cites a compelling case to foster the development of 45Ti products for PET imaging.