Search Results - "Willegaignon, Jose"

Influence on voxel-based dosimetry: noise effect on absorbed dose dosimetry at single time-point versus sequential single-photon emission computed tomography by Fonda, Uysha de S., Leitão, André L.A., Paiva, Marcia M.D.P., Willegaignon, José, Josefsson, Anders, Buchpiguel, Carlos A., Sapienza, Marcelo T.

“…The purpose of this study was to evaluate how statistical fluctuation in single-photon emission computed tomography (SPECT) images propagate to absorbed dose…”
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Accuracy in dosimetry of diagnostic agents: impact of the number of source tissues used in whole organ S value-based calculations by Josefsson, Anders, Siritantikorn, Klaikangwol, Ranka, Sagar, de Amorim de Carvalho, Jose Willegaignon, Buchpiguel, Carlos Alberto, Sapienza, Marcelo Tatit, Bolch, Wesley E., Sgouros, George

“…Background Dosimetry for diagnostic agents is performed to assess the risk of radiation detriment (e.g., cancer) associated with the imaging agent and the risk…”
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Case study: Evaluating the new University of Florida hybrid pediatric phantoms and tissue weighting factors from ICRP Publication 103 for diagnostic dosimetry by Josefsson, Anders, Hobbs, Robert, Ranka, Sagar, Schwarz, Bryan, De Amorim De Carvalho, Jose Willegaignon, Buchpiguel, Carlos Alberto, Sapienza, Marcelo Tatit, Bolch, Wesley, Sgouros, George

“…Objectives: In 1987 Christy-Eckerman developed phantoms, which were comprised of stylized organs built of simple geometries defined by mathematical surface…”
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Pediatric 131I-MIBG Therapy for Neuroblastoma: Whole-Body 131I-MIBG Clearance, Radiation Doses to Patients, Family Caregivers, Medical Staff, and Radiation Safety Measures by Willegaignon, José, Crema, Karin Paola, Oliveira, Nathaliê Canhameiro, Pelissoni, Rogério Alexandre, Coura-Filho, George Barberio, Sapienza, Marcelo Tatit, Buchpiguel, Carlos Alberto

“…PURPOSEI-metaiodobenzylguanidine (I-MIBG) has been used in the diagnosis and therapy of neuroblastoma in adult and pediatric patients for many years. In this…”
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Iodine/FDG “Flip-Flop” Phenomenon Inside a Large Metastatic Thyroid Cancer Lesion Better Characterized on SPECT/CT and PET/CT Studies by Duarte, Paulo Schiavom, Marin, José Flávio Gomes, de Carvalho, José Willegaignon de Amorim, Sapienza, Marcelo Tatit, Buchpiguel, Carlos Alberto

“…ABSTRACTIodine/FDG “flip-flop” phenomenon inside large metastatic thyroid cancer lesions has been rarely described. We present a case of this phenomenon better…”
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Brain Metastasis of Medullary Thyroid Carcinoma Without Macroscopic Calcification Detected First on 68Ga-Dotatate and Then on 18F-Fluoride PET/CT by Duarte, Paulo Schiavom, Marin, José Flávio Gomes, De Carvalho, José Willegaignon De Amorim, Sapienza, Marcelo Tatit, Buchpiguel, Carlos Alberto

“…ABSTRACTWe report a case of a medullary thyroid carcinoma noncalcified brain metastasis characterized on Ga-dotatate PET/CT but not on an F-fluoride PET/CT…”
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Ultrasonography Echotexture as a surrogate for Sialadenitis secondary to 131I Radioiodine Therapy for differentiated Thyroid Cancer: a review and metaanalysis by Lima, Graziele Aparecida Simões, López, Rossana Verónica Mendoza, Ozório, Gislaine Aparecida, de Freitas, Ricardo Miguel Costa, Willegaignon, Jose, Sapienza, Marcelo Tatit, Chammas, Maria Christina, Coura-Filho, George Barberio

“…To systematically review and analyze the medical literature to assess ultrasonography echotexture changes in thyroid cancer patients for the detection of…”
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Diagnostic reference level: an important tool for reducing radiation doses in adult and pediatric nuclear medicine procedures in Brazil by Willegaignon, José, Braga, Luis F.E.F, Sapienza, Marcelo T, Coura-Filho, George B, Cardona, Marissa A.R, Alves, Carlos E.R, Gutterres, Ricardo F, Buchpiguel, Carlos A

“…OBJECTIVESThis study aimed to establish a concise method for determining a diagnostic reference level (DRL) for adult and pediatric nuclear medicine patients…”
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Radioiodine Therapy for Graves Disease: Thyroid Absorbed Dose of 300 Gy—Tuning the Target for Therapy Planning by Willegaignon, José, Sapienza, Marcelo Tatit, Buchpiguel, Carlos Alberto

“…PURPOSESBased on the committed thyroid absorbed dose, the aim was to compare the efficiency of I therapy against Graves disease (GD) within 1 year after…”
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Prediction of iodine-131 biokinetics and radiation doses from therapy on the basis of tracer studies: an important question for therapy planning in nuclear medicine by Willegaignon, José, Pelissoni, Rogério A, Lima, Beatriz C.G.D, Sapienza, Marcelo T, Coura-Filho, George B, Buchpiguel, Carlos A

“…OBJECTIVESThis study aimed to present a comparison of iodine-131 (I) biokinetics and radiation doses to red-marrow (rm) and whole-body (wb), following the…”
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Outpatient Radioiodine Therapy for Thyroid Cancer: A Safe Nuclear Medicine Procedure by Willegaignon, José, Sapienza, Marcelo, Ono, Carla, Watanabe, Tomoco, Guimarães, Maria Inês, Gutterres, Ricardo, Marechal, Maria Helena, Buchpiguel, Carlos

“…PURPOSES:To evaluate the dosimetric effect of outpatient radioiodine therapy for thyroid cancer in members of a patientʼs family and their living environment,…”
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Determining thyroid (131)I effective half-life for the treatment planning of Graves' disease by Willegaignon, José, Sapienza, Marcelo T, Coura Filho, George Barbério, Traino, Antonio C, Buchpiguel, Carlos A

“…Thyroid (131)I effective half-life (T(eff)) is an essential parameter in patient therapy when accurate radiation dose is desirable for producing an intended…”
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Comparison of different dosimetric methods for red marrow absorbed dose calculation in thyroid cancer therapy by Willegaignon, José, Sapienza, Marcelo T, Buchpiguel, Carlos A

“…Several dosimetric methods have been proposed for estimating red marrow absorbed dose (RMAD) when radionuclide therapy is planned for differentiated thyroid…”
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Radionuclide therapy: current status and prospects for internal dosimetry in individualized therapeutic planning by Sapienza, Marcelo Tatit, Willegaignon, José

“…The efficacy and toxicity of radionuclide therapy are believed to be directly related to the radiation doses received by target tissues; however, nuclear…”
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Effects of Thyroid Hormone Withdrawal and Recombinant Human Thyrotropin on Glomerular Filtration Rate During Radioiodine Therapy for Well-Differentiated Thyroid Cancer by Coura-Filho, George Barberio, Willegaignon, Jose, Buchpiguel, Carlos Alberto, Sapienza, Marcelo Tatit

“…Renal function is related to thyroid hormonal status, and glomerular filtration rate (GFR) seems to be impaired in patients with hypothyroidism. The aim of…”
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Could the treatment of differentiated thyroid carcinoma with 3.7 and 5.55 GBq of (131I)NaI, on an outpatient basis, be safe? by Carvalho, José Willegaignon de Amorim de, Sapienza, Marcelo, Ono, Carla, Watanabe, Tomoco, Guimarães, Maria Inês, Gutterres, Ricardo, Marechal, Maria Helena, Buchpiguel, Carlos

“…OBJECTIVESThe first objective of this study was to evaluate the radiological impact on relatives and the environment because of outpatient treatment of…”
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Evaluation of Parotid Salivary Gland Echo Texture by Ultrasound Examinations and Correlation With Whole‐Body Scintigraphy After Radioiodine Therapy in Patients With Differentiated Thyroid Carcinoma by Simões Lima, Graziele Aparecida, López, Rossana Verónica Mendoza, Freitas, Ricardo Miguel Costa, Willegaignon, Jose, Sapienza, Marcelo Tatit, Chammas, Maria Christina, Coura‐Filho, George Barberio

“…Objectives This study aimed to evaluate the echo texture of the parotid salivary glands before and after radioiodine therapy (RIT) using ultrasound (US) images…”
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Comparative Dosimetry for 68Ga-DOTATATE: Impact of Using Updated ICRP Phantoms, S Values, and Tissue-Weighting Factors by Josefsson, Anders, Hobbs, Robert F, Ranka, Sagar, Schwarz, Bryan C, Plyku, Donika, Willegaignon de Amorim de Carvalho, Jose, Buchpiguel, Carlos Alberto, Sapienza, Marcelo Tatit, Bolch, Wesley E, Sgouros, George

“…The data that have been used in almost all calculations of MIRD S value absorbed dose and effective dose are based on stylized anatomic computational phantoms…”
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Comparative Dosimetry for ^sup 68^Ga-DOTATATE: Impact of Using Updated ICRP Phantoms, S Values, and Tissue-Weighting Factors by Josefsson, Anders, Hobbs, Robert F, Ranka, Sagar, Schwarz, Bryan C, Plyku, Donika, de Carvalho, Jose Willegaignon de Amorim, Buchpiguel, Carlos Alberto, Sapienza, Marcelo Tatit, Bolch, Wesley E, Sgouros, George

“…The data that have been used in almost all calculations of MIRD S value absorbed dose and effective dose are based on stylized anatomic computational phantoms…”
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Is it necessary to reduce the radioiodine dose in patients with thyroid cancer and renal failure? by Willegaignon, José, Ribeiro, Verena Pinto Brito, Sapienza, Marcelo, Ono, Carla, Watanabe, Tomoco, Buchpiguel, Carlos

“…The objective of this study were to obtain dosimetric data from a patient with thyroid cancer simultaneously undergoing peritoneal dialysis therapy, so as to…”
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