ABSTRACT
The investigation was performed in 28 children with Perthes disease, stages I-III. The comparison of visual and quantitative assessment of gamma-scintigrams has shown that the use of the coefficient of differential accumulation as a criterion of asymmetry of RP accumulation in the hip joints makes it possible to increase 4-fold the effectiveness of diagnosis at stage I of Perthes disease, the most difficult one for x-ray diagnosis. At more advanced stages neither visual nor quantitative assessment of gamma-scintigrams is superior to roentgenography. Therefore the use of gamma-scintigraphy seems appropriate in Perthes disease at stage I.
Subject(s)
Femur Head Necrosis/diagnostic imaging , Legg-Calve-Perthes Disease/diagnostic imaging , Scintillation Counting , Child , Child, Preschool , Diphosphates , Evaluation Studies as Topic , Femur Head/diagnostic imaging , Humans , Radiography , Radionuclide Imaging , Scintillation Counting/methods , Technetium , Technetium Tc 99m Medronate , Technetium Tc 99m PyrophosphateSubject(s)
Osteomyelitis/diagnostic imaging , Adolescent , Child , Child, Preschool , Chronic Disease , Computers , Humans , Radionuclide ImagingABSTRACT
The paper is concerned with a detailed description of an algorithm for picturing functional imaging of the kidneys based on the calculation of parenchymal transport time (PTT). The authors discuss the results obtained in a group of patients aged 4 to 14 with conditional normal indices. The method permits quantitative and qualitative assessment of the function of the minimum amount of nephrons of each kidney and facilitates an analysis of gamma scintigraphy results. Clinical importance of the method is discussed.
Subject(s)
Computers , Radioisotope Renography/methods , Adolescent , Algorithms , Child , Child, Preschool , Humans , Organometallic Compounds , Pentetic Acid , Technetium Tc 99m PentetateABSTRACT
Altogether 84 children aged 1 to 15 were examined. The index of 99mTc-pertechnetate relative accumulation in the ectopic gastric mucosa was proposed to be used to objectify and improve the quality of diagnosis of Meckel's diverticulum. The index over 42% was shown to be typical of Meckel's diverticulum and it can be used for automated diagnosis of the disease. The use of the above quantitative index made it possible to reject 20% of false positive results obtained at visual interpretation of scintigrams.
Subject(s)
Meckel Diverticulum/diagnostic imaging , Adolescent , Child , Child, Preschool , Humans , Infant , Methods , Radionuclide Imaging , Sodium Pertechnetate Tc 99mABSTRACT
Computerized osteoscintigrams of 54 children with osseous diseases (osteomyelitis, osseous tumors and arthritis) were analysed. 99mTc-pyrophosphate elevated accumulation in inflammatory processes was observed not only in the pathological zone but also in the epiphyses of the affected limb. The accumulation of the radiopharmaceutical agent calculated in several zones of the affected and healthy limbs provides for significant differential diagnosis of acute hematogenic osteomyelitis. In case of bone symmetric involvement by an inflammatory process and in osteomyelitis of the flat bones and the vertebral column the potentialities of the method are limited.
Subject(s)
Extremities , Osteomyelitis/diagnostic imaging , Acute Disease , Adolescent , Child , Child, Preschool , Diphosphates , Humans , Infant , Radionuclide Imaging , Technetium , Technetium Tc 99m PyrophosphateSubject(s)
Renal Artery/diagnostic imaging , Renal Circulation , Adolescent , Child , Child, Preschool , Dilatation, Pathologic/diagnostic imaging , Dilatation, Pathologic/physiopathology , Hemodynamics , Humans , Kidney Diseases/diagnostic imaging , Kidney Diseases/physiopathology , Pentetic Acid , Technetium , Technetium Tc 99m Pentetate , Tomography, Emission-Computed , Ureteral Diseases/diagnostic imaging , Ureteral Diseases/physiopathology , Urologic Diseases/diagnostic imaging , Urologic Diseases/physiopathologyABSTRACT
The renal blood circulation was studied in 17 children aged 3 to 14 using a method of adaptive simulation of the organ blood flow. The main condition for radiorenoangiography is to place correctly a gamma-chamber of the heart, lungs and kidneys in the field of vision of the crystal. It is a requisite condition for the calculation of absolute and relative renal perfusion depending on the cardiac ejection. If a patient's body size does not make it possible to have the heart and kidneys in the field of vision of the collimator at a time, one can choose the spleen as the "model" organ. The analysis of angiographic results has shown that the share of the cardiac ejection which is responsible for the renal circulation and organ function respectively, is quite a stable value that is not associated with a patient's age and body mass. Irrespective of the state of the central hemodynamics and a patient's age, the most objective information on renal perfusion proceeds from an analysis of relative indices (or perfusion indices) that are calculated on the basis of the cardiac ejection expressed in percentage (or another model organ).
