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https://www.readbyqxmd.com/read/28335802/use-of-low-dose-computed-tomography-to-assess-pulmonary-tuberculosis-among-healthcare-workers-in-a-tuberculosis-hospital
#1
Wei He, Bu-Dong Chen, Yan Lv, Zhen Zhou, Jin-Ping Xu, Ping-Xin Lv, Xin-Hua Zhou, Feng-Gang Ning, Cheng-Hai Li, Dong-Po Wang, Jie Zheng
BACKGROUND: According to the World Health Organization, China is one of 22 countries with serious tuberculosis (TB) infections and one of the 27 countries with serious multidrug-resistant TB strains. Despite the decline of tuberculosis in the overall population, healthcare workers (HCWs) are still at a high risk of infection. Compared with high-income countries, the TB prevalence among HCWs is higher in low- and middle-income countries. Low-dose computed tomography (LDCT) is becoming more popular due to its superior sensitivity and lower radiation dose...
March 24, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28316914/morphometric-analysis-of-prognathic-and-non-prognathic-mandibles-in-relation-to-bsso-sites-using-cbct
#2
Tengku Aszraf Tengku Shaeran, Ramizu Shaari, Shafulizan Abdul Rahman, Mohammad Khursheed Alam, Alauddin Muhamad Husin
BACKGROUND: Bilateral sagittal split osteotomy (BSSO) is the most versatile procedure and adopted by many surgeons to relocate the mandible in patients having mandibular prognathism (MP). Injury to the inferior alveolar nerve (IAN) and unfavorable splits are two surgical complications of BSSO which are associated with mandibular morphology. Uses of cone beam computed tomography (CBCT) in providing 3-D images has gained a wider acceptance in surgical field nowadays. Its advantages are including reduced cost, lesser radiation dose and smaller physical footprint comparing to the conventional computed tomography...
January 2017: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/28315025/practices-and-attitudes-towards-radiation-risk-disclosure-for-computed-tomography-survey-of-emergency-medicine-residency-program-directors
#3
Jennifer R Marin, Karen E Thomas, Angela M Mills, Joshua S Broder, Kathy Boutis
PURPOSE: The purposes of this study were to evaluate the frequency with which emergency physicians involved in residency leadership disclose potential malignancy risks from computed tomography (CT), assess comfort with these discussions, and evaluate factors influencing risk disclosure. METHODS: We surveyed emergency medicine residency program directors and associate/assistant directors. Primary outcome was the proportion who "almost always" or "most of the time" discussed potential risks...
March 17, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28300381/comparison-of-ct-images-with-average-intensity-projection-free-breathing-and-mid-ventilation-for-dose-calculation-in-lung-cancer
#4
Chirasak Khamfongkhruea, Sangutid Thongsawad, Chirapha Tannanonta, Sasikarn Chamchod
The purpose of this study was to compare three computed tomography (CT) images under different conditions-average intensity projection (AIP), free breathing (FB), mid-ventilation (MidV)-used for radiotherapy contouring and planning in lung cancer patients. Two image sets derived from four-dimensional CT (4DCT) acquisition (AIP and MidV) and three-dimensional CT with FB were generated and used to plan for 29 lung cancer patients. Organs at risk (OARs) were delineated for each image. AIP images were calculated with 3D conformal radiotherapy (3DCRT) and intensity-modulated radiation therapy (IMRT)...
March 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297341/assessment-of-monte-carlo-algorithm-for-compliance-with-rtog-0915-dosimetric-criteria-in-peripheral-lung-cancer-patients-treated-with-stereotactic-body-radiotherapy
#5
Damodar Pokhrel, Sumit Sood, Rajeev Badkul, Hongyu Jiang, Christopher McClinton, Christopher Lominska, Parvesh Kumar, Fen Wang
The purpose of the study was to evaluate Monte Carlo-generated dose distributions with the X-ray Voxel Monte Carlo (XVMC) algorithm in the treatment of peripheral lung cancer patients using stereotactic body radiotherapy (SBRT) with non-protocol dose-volume normalization and to assess plan outcomes utilizing RTOG 0915 dosimetric compliance criteria. The Radiation Therapy Oncology Group (RTOG) protocols for non-small cell lung cancer (NSCLC) currently require radiation dose to be calculated using tissue density heterogeneity corrections...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295382/investigation-of-interfractional-shape-variations-based-on-statistical-point-distribution-model-for-prostate-cancer-radiation-therapy
#6
Yusuke Shibayama, Hidetaka Arimura, Taka-Aki Hirose, Takahiro Nakamoto, Tomonari Sasaki, Saiji Ohga, Norimasa Matsushita, Yoshiyuki Umezu, Yasuhiko Nakamura, Hiroshi Honda
PURPOSE: The setup errors and organ motion errors pertaining to clinical target volume (CTV) have been considered as two major causes of uncertainties in the determination of the CTV-to-planning target volume (PTV) margins for prostate cancer radiation treatment planning. We based our study on the assumption that interfractional target shape variations are not negligible as another source of uncertainty for the determination of precise CTV-to-PTV margins. Thus, we investigated the interfractional shape variations of CTVs based on a point distribution model (PDM) for prostate cancer radiation therapy...
March 15, 2017: Medical Physics
https://www.readbyqxmd.com/read/28292601/a-survey-of-cone-beam-computed-tomographic-use-among-endodontic-practitioners-in-the-united-states
#7
Frank C Setzer, Nathan Hinckley, Meetu R Kohli, Bekir Karabucak
INTRODUCTION: Cone-beam computed tomographic (CBCT) imaging is an emerging technology for clinical endodontic practice. The aim of this study was to investigate the acceptance, accessibility, and usage of CBCT imaging among American Association of Endodontists members in the United States by means of an online survey. METHODS: An invitation to participate in a web-based survey was sent to 3076 members of the American Association of Endodontists. The survey consisted of 8 questions on demographics, access to CBCT machines, field of view (FOV), frequency of use for particular applications, and reasons in case CBCT was not used...
March 11, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28291918/organ-motion-in-pediatric-high-risk-neuroblastoma-patients-using-four-dimensional-computed-tomography
#8
Sneha Kannan, Boon-Keng Kevin Teo, Timothy Solberg, Christine Hill-Kayser
PURPOSE/OBJECTIVE(S): High-risk neuroblastoma (HR-NBL) requires multimodality treatment, including external beam radiation of the primary tumor site following resection. Radiotherapy planning must take into account motion of the target and adjacent normal anatomy, both of which are poorly understood in the pediatric population, and which may differ significantly from those in adults. METHODS/MATERIALS: We examined 4DCT scans of 15 consecutive pediatric patients treated for HR-NBL, most with tumors in the abdominal cavity...
January 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28287916/the-effect-of-contrast-medium-on-radiation-dose-in-ct-part-ii-a-systematic-evaluation-across-58-patient-models
#9
Pooyan Sahbaee, Ehsan Abadi, W Paul Segars, Daniele Marin, Rendon C Nelson, Ehsan Samei
Purpose To estimate the radiation dose as a result of contrast medium administration in a typical abdominal computed tomographic (CT) examination across a library of contrast material-enhanced computational patient models. Materials and Methods In part II of this study, first, the technique described in part I of this study was applied to enhance the extended cardiac-torso models with patient-specific iodine-time profiles reflecting the administration of contrast material. Second, the patient models were deployed to assess the patient-specific organ dose as a function of time in a typical abdominal CT examination using Monte Carlo simulation...
March 13, 2017: Radiology
https://www.readbyqxmd.com/read/28281862/model-based-approach-for-quantitative-estimates-of-skin-heart-and-lung-toxicity-risk-for-left-side-photon-and-proton-irradiation-after-breast-conserving-surgery
#10
Francesco Tommasino, Marco Durante, Vittoria D'Avino, Raffaele Liuzzi, Manuel Conson, Paolo Farace, Giuseppe Palma, Marco Schwarz, Laura Cella, Roberto Pacelli
BACKGROUND: Proton beam therapy represents a promising modality for left-side breast cancer (BC) treatment, but concerns have been raised about skin toxicity and poor cosmesis. The aim of this study is to apply skin normal tissue complication probability (NTCP) model for intensity modulated proton therapy (IMPT) optimization in left-side BC. MATERIAL AND METHODS: Ten left-side BC patients undergoing photon irradiation after breast-conserving surgery were randomly selected from our clinical database...
March 10, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28267552/safety-issues-and-updates-under-mr-environments
#11
REVIEW
Soo Jung Kim, Kyung Ah Kim
Magnetic resonance (MR) imaging is a useful imaging tool with superior soft tissue contrast for diagnostic evaluation. The MR environments poses unique risks to patients and employees differently from ionizing radiation exposure originated from computed tomography and plain x-ray films. The technology associated with MR system has evolved continuously since its introduction in the late 1970s. MR systems have advanced with static magnetic fields, faster and stronger gradient magnetic fields and more powerful radiofrequency transmission coils...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28244420/is-dose-deformation-invariance-hypothesis-verified-in-prostate-igrt
#12
Antoine Simon, Amandine Le Maitre, Mohamed Nassef, Bastien Rigaud, Joël Castelli, Oscar Acosta, Pascal Haigron, Caroline Lafond, Renaud de Crevoisier
PURPOSE: To assess dose uncertainties resulting from the dose deformation-invariance hypothesis in prostate cone beam computed tomography (CT)-based image guided radiation therapy (IGRT), namely to evaluate whether rigidly propagated planned dose distribution enables good estimation of fraction dose distributions. METHODS AND MATERIALS: Twenty patients underwent a CT scan for planning intensity modulated radiation therapy-IGRT delivering 80 Gy to the prostate, followed by weekly CT scans...
March 15, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28244412/delineation-of-internal-mammary-nodal-target-volumes-in-breast-cancer-radiation-therapy
#13
Krishan R Jethwa, Mohamed M Kahila, Katie N Hunt, Lindsay C Brown, Kimberly S Corbin, Sean S Park, Elizabeth S Yan, Judy C Boughey, Robert W Mutter
PURPOSE: The optimal clinical target volume for internal mammary (IM) node irradiation is uncertain in an era of increasingly conformal volume-based treatment planning for breast cancer. We mapped the location of gross internal mammary lymph node (IMN) metastases to identify areas at highest risk of harboring occult disease. METHODS AND MATERIALS: Patients with axial imaging of IMN disease were identified from a breast cancer registry. The IMN location was transferred onto the corresponding anatomic position on representative axial computed tomography images of a patient in the treatment position and compared with consensus group guidelines of IMN target delineation...
March 15, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28243923/risks-and-benefits-of-reducing-target-volume-margins-in-breast-tangent-radiotherapy
#14
Deepak Basaula, Alexandra Quinn, Amy Walker, Vikneswary Batumalai, Shivani Kumar, Geoff P Delaney, Lois Holloway
This study investigates the potential benefits of planning target volume (PTV) margin reduction for whole breast radiotherapy in relation to dose received by organs at risk (OARs), as well as reductions in radiation-induced secondary cancer risk. Such benefits were compared to the increased radiation-induced secondary cancer risk attributed from increased ionizing radiation imaging doses. Ten retrospective patients' computed tomography datasets were considered. Three computerized treatment plans with varied PTV margins (0, 5 and 10 mm) were created for each patient complying with the Radiation Therapy Oncology Group (RTOG) 1005 protocol requirements...
February 27, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28243884/role-of-ct-in-congenital-heart-disease
#15
REVIEW
Prabhakar Rajiah, Sachin S Saboo, Suhny Abbara
Congenital heart diseases (CHD) are being increasingly encountered in cardiac imaging due to improved outcomes from surgical and interventional techniques. Imaging plays an important role in the evaluation of CHD, both prior to and after surgeries and interventions. Computed tomography (CT) has several advantages in the evaluation of these disorders, particularly its high spatial resolution, multi-planar reconstruction capabilities at sub-millimeter isotropic resolution, good temporal resolution, wide field of view, and rapid turnaround time, which minimizes the need for sedation and anesthesia in young children or children with disabilities...
January 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28243706/bone-texture-analysis-using-ct-simulation-scans-to-individuate-risk-parameters-for-radiation-induced-insufficiency-fractures
#16
V Nardone, P Tini, S F Carbone, A Grassi, M Biondi, L Sebaste, T Carfagno, E Vanzi, G De Otto, G Battaglia, G Rubino, P Pastina, G Belmonte, L N Mazzoni, F Banci Buonamici, M A Mazzei, L Pirtoli
This study deals with the role of texture analysis as a predictive factor of radiation-induced insufficiency fractures in patients undergoing pelvic radiation. INTRODUCTION: This study aims to assess the texture analysis (TA) of computed tomography (CT) simulation scans as a predictive factor of insufficiency fractures (IFs) in patients with pelvic malignancies undergoing radiation therapy (RT). METHODS: We performed an analysis of patients undergoing pelvic RT from January 2010 to December 2014, 24 of whom had developed pelvic bone IFs...
February 27, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28217017/prognostic-significance-of-standardized-uptake-value-on-18-fluorine-fluorodeoxyglucose-positron-emission-tomography-computed-tomography-in-patients-with-nasopharyngeal-carcinoma
#17
Şeyda Türkölmez, Sabire Yılmaz Aksoy, Elif Özdemir, Zuhal Kandemir, Nilüfer Yıldırım, Atiye Yılmaz Özsavran, Mehmet Faik Çetindağ, Kenan Köse
The aim of this study was to investigate the prognostic significance of standardized uptake value (SUV) on 18 fluorine-fluorodeoxyglucose ((18)F-FDG) positron emission tomography/computed tomography (PET/CT) in patients with nasopharyngeal carcinoma (NPC). Thirty-four patients who have histologically proven NPC and underwent (18)F-FDG PET/CT were included in this study. After (18)F-FDG PET/CT, all the patients received radiation therapy and 32 of them received concomitant weekly chemotherapy. The maximum SUV (SUVmax) at the primary tumor and the SUVmaxof the highest neck nodes were determined...
January 2017: World Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28187100/prognostic-significance-of-the-standardized-uptake-value-of-pretherapeutic-18f-labeled-2-fluoro-2-deoxyglucose-positron-emission-tomography-computed-tomography-in-patients-with-locally-advanced-cervical-cancer
#18
Ajit Gubbi, Shimoni Kacheria, Sarfraz Ahmad, Nicole M Stavitzski, James E Kendrick
OBJECTIVES: To determine the prognostic significance of the pretreatment and posttreatment maximum standardized uptake value (SUVmax) of F-labeled 2-fluoro-2-deoxyglucose positron emission tomography (PET)/computed tomography imaging in patients with stage IB2-IVA cervical cancer. METHODS: This was a retrospective review of cervical cancer patients with International Federation of Gynecology and Obstetrics stages IB2-IVA, from March 2008 to April 2014. All patients had pretreatment and posttreatment PET imaging and received primary whole pelvic radiation therapy with concurrent radiosensitizing chemotherapy, followed by intracavitary brachytherapy...
March 2017: International Journal of Gynecological Cancer
https://www.readbyqxmd.com/read/28179338/cancer-death-risk-related-to-radiation-exposure-from-computed-tomography-scanning-among-testicular-cancer-patients
#19
Eeva Salminen, Hannele Niiniviita, Hannu Järvinen, Sirpa Heinävaara
BACKGROUND: A study of the computed tomography (CT) imaging related effective doses and radiation-related cancer death risk. PATIENTS AND METHODS: Estimate effective doses were computed from CT scans of testicular cancer patients treated and followed-up in Turku University Hospital, South Western Finland. Association between effective doses from follow-up CT scans and radiation-induced cancer death was examined using United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) 2008 formula...
2017: Anticancer Research
https://www.readbyqxmd.com/read/28179230/exposure-to-low-dose-computed-tomography-for-lung-cancer-screening-and-risk-of-cancer-secondary-analysis-of-trial-data-and-risk-benefit-analysis
#20
Cristiano Rampinelli, Paolo De Marco, Daniela Origgi, Patrick Maisonneuve, Monica Casiraghi, Giulia Veronesi, Lorenzo Spaggiari, Massimo Bellomi
Objective To estimate the cumulative radiation exposure and lifetime attributable risk of cancer incidence associated with lung cancer screening using annual low dose computed tomography (CT).Design Secondary analysis of data from a lung cancer screening trial and risk-benefit analysis.Setting 10 year, non-randomised, single centre, low dose CT, lung cancer screening trial (COSMOS study) which took place in Milan, Italy in 2004-15 (enrolment in 2004-05). Secondary analysis took place in 2015-16.Participants High risk asymptomatic smokers aged 50 and older, who were current or former smokers (≥20 pack years), and had no history of cancer in the previous five years...
February 8, 2017: BMJ: British Medical Journal
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