Causes of False-Positive Results in 68Ga-Labeled Fibroblast Activation Protein Inhibitor PET/CT Imaging / 中国医学科学院学报

Objective To investigate the causes of false-positive results in the 68Ga-labeled fibroblast activation protein inhibitor (68Ga-FAPI-04) PET/CT imaging. Methods The imaging data of 547 patients undergoing 68Ga-FAPI-04 PET/CT examination in the Department of Nuclear Medicine of the Affiliated Hospital of Southwest Medical University from September 2020 to May 2021 were retrospectively collected.Two experienced nuclear medicine diagnostic physicians analyzed the clinical data,relevant imaging examinations,laboratory examinations,pathological results and follow-up results of the patients with false-positive results. Results The 68Ga-FAPI-04 PET/CT imaging of 547 patients showed false-positive results in 99 (18.1%) patients,including 56 males and 43 females.The postoperative pathological examination confirmed false-positive results in 13 patients,including 1 patient of thyroiditis,2 patients of pulmonary tuberculosis,1 patient of bone tuberculosis,2 patients of pulmonary inflammatory pseudotumor,1 patient of pulmonary sarcoidosis,1 patient of pulmonary benign fibroma,1 patient of organic pneumonia,2 patients of renal angiomyolipoma,1 patient of mass pancreatitis,and 1 patient of pancreatic mucinous cystadenoma.The medical history,relevant imaging examination,and long-term follow-up confirmed false-positive results in 86 patients.Specifically,the false-positive uptake in the neck,chest,abdomen,bone joint,and skin occurred in 8 (9.3%),13 (15.1%),5 (5.8%),57 (66.3%),and 3 (3.5%) patients,respectively.Inflammation-related uptake appeared in 83 (83.8%) patients with false-positive imaging results,of which arthritis (23 patients) and osteophyte (29 patients) were the most common.Sixteen (16.2%) patients showed the false-positive uptake related to fibroblasts. Conclusion 68Ga-FAPI-04 PET/CT imaging will show non-malignant tumor false-positive results,which are mainly associated with inflammation and fibroblasts.

Research hotspots of prostate cancer at the international conferences on urology in 2022 / 浙江大学学报·医学版

The American Urological Association (AUA), European Association of Urology (EUA) and International Urological Society (SIU) annual meetings were held in 2022. Studies on prostate cancer reported in the meetings mainly focus on the advances of diagnostic biomarkers (such as α-2, 3-1inked sialylation of terminal N-glycan on free PSA density, SelectMDx) and imaging techniques [such as multiparametric magnetic resonance imaging, prostate specific membrane antigen(PSMA)-PET/CT], the new method for prostate biopsy, the new treatments of prostate cancer including [177Lu] Ludotadipep and DROP-IN PSMA probe, and the prognosis assessment of prostate cancer (such as AR-V7). This article provides an overview on the research hotspots of three international academic meetings.

68Ga-PSMA ligand PET/CT integrating indocyanine green-guided salvage lymph node dissection for lymph node metastasis after radical prostatectomy / 亚洲男科学杂志(英文版)

To efficiently remove all recurrent lymph nodes (rLNs) and minimize complications, we developed a combination approach that consisted of 68Gallium prostate-specific membrane antigen (PSMA) ligand positron emission tomography (PET)/computed tomography (CT) and integrated indocyanine green (ICG)-guided salvage lymph node dissection (sLND) for rLNs after radical prostatectomy (RP). Nineteen patients were enrolled to receive such treatment. 68Ga-PSMA ligand PET/CT was used to identify rLNs, and 5 mg of ICG was injected into the space between the rectum and bladder before surgery. Fluorescent laparoscopy was used to perform sLND. While extensive LN dissection was performed at level I, another 5 mg of ICG was injected via the intravenous route to intensify the fluorescent signal, and laparoscopy was introduced to intensively target stained LNs along levels I and II, specifically around suspicious LNs, with 68Ga-PSMA ligand PET/CT. Next, both lateral peritonea were exposed longitudinally to facilitate the removal of fluorescently stained LNs at levels III and IV. In total, pathological analysis confirmed that 42 nodes were rLNs. Among 145 positive LNs stained with ICG, 24 suspicious LNs identified with 68Ga-PSMA ligand PET/CT were included. The sensitivity and specificity of 68Ga-PSMA ligand PET/CT for detecting rLNs were 42.9% and 96.6%, respectively. For ICG, the sensitivity was 92.8% and the specificity was 39.1%. At a median follow-up of 15 (interquartile range [IQR]: 6-31) months, 15 patients experienced complete biochemical remission (BR, prostate-specific antigen [PSA] <0.2 ng ml-1), and 4 patients had a decline in the PSA level, but it remained >0.2 ng ml-1. Therefore, 68Ga-PSMA ligand PET/CT integrating ICG-guided sLND provides efficient sLND with few complications for patients with rLNs after RP.

The state of the art of imaging in gastroenteropancreatic neuroendocrine tumors / 浙江大学学报·医学版

Gastroenteropancreatic neuroendocrine tumors (GEP-NETs) are neoplasms presenting unpredictable and unusual biologic behavior that causes many clinical challenges. NETs can produce a variety of metabolically active substances (hormones and amines) leading to distinct clinical syndromes. This review will discuss the imaging techniques for the diagnosis of GEP-NETs including ultrasonography, CT, MRI and ultrasound endoscope. In this article, Gallium-68 labeled peptide binding to G protein coupled receptor including SSTR, CCKR1 and GLP1R is addressed, and the application of Gallium-68 labeled somatostin analogues and PET-CT for diagnosis of GEP-NETs is evaluated. In conclusion, Gallium-68 labeled peptide and molecular imaging will play important roles in diagnosis, prognosis and therapeutic strategy development of GEP-NETs.

Utilidad del citrato de galio 67 en el diagnóstico de fiebre de origen desconocido / Effectiveness of gallium 67 citrate in diagnosing fever of unkown origin

Se presenta el caso de un paciente con cuadro de 4 meses de evolución de fiebre intermitente, pérdida no cuantificada de peso y diaforesis nocturna. El examen físico reveló hepatoesplenomegalia sin otras alteraciones. Los estudios iniciales mostraron anemia macrocítica-hipocrómica, y las serologías para VIH, hepatitis B y hepatitis C fueron negativas. La TAC de cuello reportó adenomegalias cervicales subcutáneas bilaterales; a una de ellas se le tomó una biopsia, que resultó negativa para malignidad o infección. El objetivo de este reporte es ilustrar la utilidad del 67Gacitrato en el estudio de la fiebre de origen desconocido.

Presentation is made of the case of a patient with a 4-month history of intermittent fever, unquantified weight loss and night sweating. Physical examination revealed heptosplenomegaly, with no additional alterations. Initial studies showed macrocytic-hypochromic anemia; serology tests for HIV, hepatitis B, and hepatitis C were negative. CT of the neck reported bilateral subcutaneous cervical lymphadenopathy; biopsy was performed on one, which resulted negative for malignancy or infection. The purpose of this report is to illustrate the effectiveness of Ga-citrate 67 in the study of fever of unknown origin.

Comparison between early and delayed images of [67]Ga scintigraphy for evaluation of recurrent lymphoma

Despite widespread use of [67]Gallium for lymphoma evaluation, timing of imaging after injection is a matter of controversy and to the extent of our knowledge no direct comparison has been made between early and delayed gallium images. We aimed to compare 24 and 48 hours post injection planar gallium imaging for evaluation of lymphoma recurrence. 255 patients suspicious of recurrent lymphoma were included in the study. Twenty four and 48 hours post injection [10 mCi] whole body Gallium imaging was performed. Semi-quantitative evaluation [background corrected] was carried out in positive whole body [67]Gallium scans. Diagnosis of recurrence was made by combination of clinical or pathologic examination if possible. In 59 patients the final diagnosis was made by tissue biopsy. In case of uncertain diagnosis, follow up of the patients [mean duration of 13 months] was used. The diagnosis was finally made by the referring hematologist. Whole body gallium scintigraphy was positive in 115 out of 150 patients with recurrence [sensitivity of 76%]. Comparison of the 24 and 48 hour images did not show any new lesion in the 48 hour images. However, delayed 48 hours images were required for definite detection of the gallium avid lesions in the abdominal and pelvic areas in 40 patients. Semi-quantitative evaluation of the lesion showed higher lesion to background ratio for 48 compared to the 24 hour images [p<0.001]. Considering higher lesion to background activity in the 48 hour images, delayed whole body [67]Gallium imaging may be more desirable for diagnosis of recurrent lymphoma, however 24 hour images may be sufficient. Delayed imaging can be reserved for suspicious activities [such as in abdominal images]. The strategy can save time and is more convenient for the imaging centers

Preparation and biodistribution study of [67]Ga-gallium calcitonin

In order to develop a radiolabeled calcitonin [CT] derivative for receptor imaging studies, CT was successively labeled with [67]G-gallium chloride. The best results of the conjugation were obtained by the addition of 0.5 ml of a CT nasal pharmaceutical solution [1100 IU] to a glass tube pre-coated with DTPA-dianhydride [0.01 mg] at 25 [degree sign] with continuous mild stirring for 30 min. after solid phase purification of the radiolabeled hormone, instant thin layer chromatography [ITLC] showed radiochemical purity of higher than 95% at optimized conditions [specific activity = 67-134 KBq/IU, labeling efficiency 70%]. [67]Ga-DTPA-CT mainly accumulates in the liver. Preliminary in vivo studies [ID/g%] in male wild-type rats showed significant liver uptake of the tracer after 24 hours. [67]Ga-DTPA-CT can be a suitable probe for biodistribution study of CT receptors in various physiological as well as neoplastic lesions with over-expressed calcitonin receptors

Pattern Analysis of 67Gallium Scintigraphy in Sarcoidosis / 결핵및호흡기질환

BACKGROUND: 67Ga scintigraphy has been used for years in sarcoidosis for diagnosis and to determine the extent of the disease. The present report is a study of various findings of 67Ga scintigraphy in patients with sarcoidosis. METHODS: Between 1998 and 2007, 16 patients (male:female, 6:10; age, 35.9+/-15.3 years) with histologically proven sarcoidosis underwent clinical evaluation and 67Ga scintigraphy. According to the site of involvement, they were divided into subtypes and analyzed. RESULTS: Sixteen patients with sarcoidosis had involvement of various organs, including lymph nodes (13/16, 81.3%), lung (3/16, 18.8%), muscle (1/16, 6.3%), subcutaneous tissue (1/16, 6.3%), glands (1/16, 6.3%), and bone (1/16, 6.3%). Sites of involved lymph nodes were thorax (12/13, 92.3%), supraclavicular area (5/13, 38.5%), inguinal area (2/13, 15.4%), abdomen (2/13, 15.4%), and pelvis (1/13, 7.7%). CONCLUSION: Because sarcoidosis frequently involves multiple organs, 67Ga scintigraphy is a useful method in for evaluating the whole body. Nuclear medicine physicians should be familiar with the various findings of gallium uptake in sarcoidosis.

Oral steroid therapy for frozen shoulder / Terapia de esteroides orales para el hombro congelado

BACKGROUND: Since frozen shoulder is characterized by spontaneous recovery, no precise treatment strategy exists. Both conservative therapy and arthroscopic surgery is available, but the time required for recovery varies considerably. This study looks at the possible early symptom relief with oral steroid therapy. SUBJECTS AND METHODS: The subjects were 76 patients aged 33 to 73 years at the beginning of the study. The duration of the frozen shoulder was one to 15 months (mean 5.7 months) and hypertension was noted in 13 patients as a complicated disorder. A single course of steroid therapy consisted of a total dose of 105 mg of prednisolone over approximately a three-week period by the dose-tapering method. The number of courses varied with the degree of symptom relief, but the rest period between courses was always approximately four weeks. The results were assessed on the basis of the Japanese Orthopaedic Association (JOA) score, but the principal evaluations were pain and range of motion. RESULTS: The average ranges of motion before treatment were 102.8º of forward flexion 11.3º of external rotation and internal, rotation was at the buttocks. However, after one course of treatment, forward flexion was 136º, external rotation was 33.7º, and internal rotation was limited to the buttocks in only six cases. CONCLUSION: The results of oral steroid therapy for frozen shoulder were highly satisfactory. However, sufficient care is required in explaining the method of administration and the adverse effects such as the osteonecrosis of the femoral head or osteoporosis.

ANTECEDENTES: Como que el hombro congelado se caracteriza por la recuperación espontánea, no existe una estrategia de tratamiento precisa. Tanto la terapia conservadora como la cirugía artroscópica se hallan a disposición, pero el tiempo requerido para la recuperación varía considerablemente. Este estudio echa una ojeada al posible alivio de los síntomas tempranos por medio de la terapia de esteroides orales. SUJETOS Y MÉTODO: Los sujetos fueron 76pacientes en edades de 33 a 73 años al comienzo del estudio. La duración del hombro congelado fue de 1 a 15 meses (promedio 5.7 meses), y se observó hipertensión en 13 pacientes como una condición co-mórbida. Un solo tratamiento con esteroides consistía en una dosis total de 105 mg de prednisolona por un período de aproximadamente tres semanas mediante el método de reducción gradual de la dosis. El número de tratamientos varió de acuerdo con el grado de alivio del síntoma, pero el período de descanso entre tratamientos fue aproximadamente de cuatro semanas. Los resultados fueron evaluados sobre la base de la puntuación establecida por la Asociación Ortopédica del Japón (JOA), y las evaluaciones principales fueron el dolor y el alcance del movimiento. RESULTADOS: El rango promedio del movimiento antes del tratamiento fue 102.8º deflexión delantera, y 11.3º de rotación externa y la rotación interna fue en las nalgas. Sin embargo, luego de un tratamiento, la flexión delantera fue 136º, la rotación externa fue 33.7º, y la rotación interna estuvo limitada a las nalgas en sólo seis casos. CONCLUSIÓN: Los resultados de la terapia de esteroides orales para el hombro congelado, fueron altamente satisfactorias. Sin embargo, se requiere suficiente cuidado al explicar el método de administración y los efectos adversos, tales como la osteonecrosis de la cabeza del fémur o la osteoporosis.

Role of (68)Ga-DOTATOC PET/CT in the Evaluation of Primary Pulmonary Carcinoids

BACKGROUND/AIMS: Although carcinoid tumors usually have good prognosis, early and specific diagnosis is important. Computed tomography and magnetic resonance imaging do not provide findings that are specific for carcinoids, and somatostatin receptor scintigraphy suffers from low spatial resolution. 18-Fluorodeoxyglucose positron emission tomography/computed tomography ((18)F-FDG PET/CT) has limited sensitivity for carcinoids due to low uptake of the marker. A PET/CT system that uses the somatostatin receptor-based PET tracer 1,4,7,10-tetraazacyclododecane-N(I),N(II),N(III),N(IIII)-tetraacetic acid (D)-Phe(1)-thy(3)-octreotide ((68)Ga-DOTATOC) has also been used in the evaluation of carcinoids, although information regarding its use for the detection of primary pulmonary carcinoids is limited. Thus, we investigated the value of (68)Ga-DOTATOC PET/CT for the diagnosis of primary pulmonary carcinoid tumors. METHODS: This was a retrospective analysis of patients with primary pulmonary tumors who underwent (68)Ga-DOTATOC PET/CT. All the patients had a histopathologic diagnosis of carcinoid. The rate of detection of primary pulmonary carcinoid tumors using (68)Ga-DOTATOC PET/CT was assessed. RESULTS: Twenty patients were diagnosed as having carcinoid, and 19 tumors showed significant uptake on (68)Ga-DOTATOC (detection rate, 95%). The maximal standardized uptake value (SUV(max)) ranged from 1.1 to 66, with a median value of 21.6. In one patient, (68)Ga-DOTATOC PET/CT revealed additional lesions. CONCLUSIONS: Our results demonstrate that (68)Ga-DOTATOC PET/CT is useful in the evaluation of primary pulmonary carcinoids and should be included in the diagnostic work-up of these patients.

Preparation and biodistribution of [67Ga]-labeledoxytocin for SPECT purposes

Oxytocin [OT] is a paracrine hormone with various biological activities and many sex organs in both sexes, as well as many tumor cells have shown to have related receptors. In this study the development of a receptor imaging tracer for possible tumor imaging has been described. OT was successively labeled with [67Ga]-gallium chloride after conjugation with freshly prepared cyclic DTPA-dianhydride. The best results of the conjugation were obtained by the addition of 1 ml of a OT pharmaceutical solution [2 mg/ml, in phosphate buffer, pH=8] to a glass tube pre-coated with DTPA-dianhydride [0.02 mg] at 25°C with continuous mild stirring for 30 min. Radiochemical purity [RCP] of the labeled compound was determined, using RTLC and ITLC followed by stability tests and animal biodistribution studies. Radiolabeling took about 60 minutes with a RCP higher than 98% at optimized conditions [specific activity = 1000 Ci/mM, labeling efficiency 80%]. The stability of the tracer at room temperature was significant, up to an hour. Preliminary in vivo studies in normal female rat model showed ovary/blood and ovary/muscle ratio uptake of the tracer in 60 minutes to be 4.53 and 9.18, respectively. The result was consistent with the reported OT receptor distribution in normal female mammals. The radiolabeled oxytocin, prepared in this study, was a possible fast acting tracer for OT receptor imaging; studies however, more studies are required to determine the best imaging conditions especially in larger mammal animals

application of unconventional PET tracers in nuclear medicine

The production and application of PET tracers has been a unique step in the progress of nuclear medicine in last two decades. The most important PET tracers include F-18, C-l 1 and N-13 radioisotopes and many nuclear medicine centers throughout the globe are using them. However some new tracers are under their way to the mass administration, currently being in the clinical trials or preliminary studies. Gallium-66 and 68 tracers such as Ga-DOTANOC and Ga-DOTANIC are currently being used in many neuroendocrine tumor studies in human in Europe and North America, and global application of these tracers remain to the cheaper and easier providence of [68]Ge[68]Ga generators. Copper tracers such as[61,62,64]Cu-ATSM and [61,62,64]Cu-PTSM are the most important unconventional tracers used in hypoxia and perfusion studies respectively using PET technology. Copper tracers can easily be produced using a medium cyclotron with simple chemistry. Many other interesting PET radioisotopes such as Tc-94m [HL. 52 min], 1-124 [HL. 100h], Y-86 [HL. 14.7] and rubidium tracers are being studied in some research centers in the world. This review article would describe the properties, mechanisms, production routes and problems of unconventional PET tracers with a look to the future of some important drug candidates

Evaluation of [[67]Ga] citrate in the detection of various microorganism infections in animal models

Gallium-67 citrate has been known as a good infection agent in nuclear medicine for decades. In this work the value of [67]Ga-citrate has been investigated in infected animal models using SPECT imaging at optimized/standardized conditions. The bacterial [Staphylococcus aureus; S.a. and Escherichia coli; E.c.] and fungal [Candidae albicans; C.a.] species from standard sources were cultured according to the standard procedures and wild-type NMRI rats were inoculated by the injection of 5x10[7] microorganisms [MO] into their thighs and animals incubated for infection site formation for 2 and 3 days followed by iv injection of freshly prepared [67]Ga-citrate [45-50 micro Ci] and SPECT imaging performed at 2, 4 and 24 hours post injection in parallel with control groups. In S.a.-infected rats [67]Ga-citrate demonstrated hot spot foci at all time intervals esp. 24h post injections in contrast with normal animal scans. In case of C.a., the infected animals also demonstrated significant accumulation foci being most significant after 24h. In E.c.-infected animals however weak positive scans were obtained even after 24 hours. Our animal models developed for the evaluation of new infection-targeting agents were successfully positive using [67]Ga scan. These models can also be used in the evaluation of newly developed antibiotics in animal models for in vivo studies. The efficacy of [67]Ga-scan in our microorganism infection models can be summarized as S.A.>C.a.>E.c.

Gallium-68 (68Ga); the revival of an old positron emission tomography (PET) agent: the leading experience in Chile

In January 2008, we set up a 68Ge/ 68Ga generator able to produce enough quantities of 68Ga to label the same polypeptides, somatostatin analogos, used to treat patients suffering from neuroendocrine tumors. As far as we know, this is the first time that such a device is installed in Latin-America for specific PET/CT imaging different from 18F. During the last three months we have studied 30 patients for staging, re-staging and treatment control of neuroendocrine tumors using PET/CT images with 68Ga-DOTATATE. In all cases the image quality was excellent, providing clinically useful information in most of them. 68Ga is a very promising positron emitter radionuclide, cyclotron-independent, to label peptides and other molecules that open a wide window for Molecular Imaging.

En Enero de 2008 instalamos un generador de 68Ge/ 68Ga capaz de producir cantidades suficientes de 68Ga para marcar los mismos péptidos, análogos de la somatostatina, utilizados para el tratamiento de pacientes con tumores neuroendocrinos. De acuerdo con nuestro conocimiento, esta es la primera vez que se utilizada este aparato en Latinoamérica para obtener imágenes PET/CT específicas con un agente diferente al 18F. Durante los últimos tres meses hemos estudiado 30 pacientes con tumores neuroendocrinos con 68Ga-DOTATATE para etapificación, re-etapificación y control de tratamiento mediante imágenes PET/CT. En todos los casos la calidad de la imagen fue excelente proporcionando información clínicamente útil en la mayoría de ellos. 68Ga es un promisorio radionucleido emisor de positrones, independiente de un ciclotrón, para marcar péptidos y otras moléculas abriendo una amplia ventana para las Imágenes Moleculares.

Evaluation of radiolabeled streptokinase for thrombosis imaging

Cardiovascular disease is the major cause of morbidity and mortality in developing and developed countries. Rapid diagnosis of the thrombosis can be an essential step in management of the stroke. In this work a recently developed radiolabeled streptokinase [STP] tracer was evaluated in an animal thrombotic model using SPECT imaging and biodistribution studies. Locally labeled [67Ga]-Streptokinase was checked by ITLC, HPLC and SDS-PAGE experiments to check the tracer integrity and purity. The biodistribution studies were performed in thrombotic femoral vein of rats using tissue counting and preliminary SPECT studies, respectively [up to 2 h]. [67Ga]-Streptokinase prepared with suitable radiochemical purity [HPLC >95%, ITLC >99%] was administered to FeCl3 induced thrombotic rats and the percentage of injected dose per gram of tissue [ID/g%] as well as the SPECT images demonstrated the good specific binding of the tracer in thrombotic clots located in heart and aorta 2 hours post injection. [67Ga]-DTPA-STP can be a suitable probe for imaging of thrombosis in cardiovascular diseases. Ga-68 labeled STP has the potential to be an alternative superior labeled compound due to positron emission properties for PET studies as well as appropriate physical half life

Utilidad de la deoxiglucosa marcada con flúor-18 (FDG) en el manejo de los linfomas / Role of 18Fluorine-deoxyglucose (FDG) positron emission tomography in the management of lymphomas

Positron emission tomography (PET) with fluorine-18 labeled deoxyglucose (FDG) is useful in the management of lymphomas. In this review, some general concepts of this metabolic test are defined. It has an excellent diagnostic yield in Hodgkin disease as well as in most non Hodgkin lymphomas. Staging, restaging residual mass evaluation and the control of therapy are the main indications for FDG-PET. Images with FDG have a high diagnostic and prognostic value, that is superior to anatomical images and conventional staging techniques. They are also helpful for the assessment of tumor activity in abnormal lymph nodes or large masses that have been treated and reduce their size slowly or show an incomplete resolution. Currently, the resolution of dedicated PET equipments is 6 mm and bigger lesions can easily be detected. The main differences and advantages of FDG versus gallium-67 in lymphoma are also discussed, as well as the initial local experience with the technique in lymphoma patients.

Production of Ga-66 from natural zinc

In this study, production of Gallium-66 by irradiation of natural zinc target with 15 MeV protons was verified.Gallium-66 is an intermediate-lived radioisotope that has potential for positron emission tomography (PET), along study of the biological processes with intermediate to slow target tissue uptake. 66Ga [t1/2 = 9.49 h; ß+ (56.5 percent), EC(43.5 percent)] can be used in a large number of labeled proteins, peptides, and small molecules. We have produced 66Ga by irradiation of natural Zinc with 15 MeV proton beam, using the cyclotron -30Cyclon- at nuclear research center for agriculture and medicine. A 400µm Zinc target with copper backing substrate was irradiated for 1.5 hours with total integrated current 250µAh. Gallium has been purified from irradiated targets by passing through the cation exchange column and diisopropyl ether extraction. The concentration of zinc and copper in 0.1 and 0.5 ppm were respectively measured by polarography. In order to detect impurities, gallium radioisotopes were detected by a Canberra HPGe gamma spectrometer. The production yield at EOB was 7mCi/µAh with total activity of 1.75 Ci for Gallium-66. The ratio of activity at 9 hours after the EOB for 66Ga(t 1/2=9.5h), 68Ga(t1/2=1.1h) and 67Ga(t1/2=78h) was 98.63 percent, 1.12 percent and 0.25 percent respectively. The amount of 64Ga(t1/2=0.04h), and 70Ga(t1/2=0.35h) was not detectable. Due to using natural zinc, this method could be considered as an inexpensive method for laboratories studies. The production process comparing the irradiation of natural copper has no impurity such as copper-61, 64 and 67. The purification including cation-exchange and ether extraction afforded high yield beside negligible concentrations of copper and stable zinc as chemical impurity.