Imaging volumes during COVID-19: A Victorian health service experience

Table 1 List of equipment number across all modalities

Modality	MRI	NM	BMD	CT	X-ray	Fluoro	US	Angio
Equip No.	5	6	2	7	26	4	45	3

MRI: Magnetic resonance imaging; NM: Nanometer; BMD: Bone mineral densitometry; CT: Computed tomography; Fluoro: Fluoroscopy; US: Ultrasound; Angio: Angiography.

Table 2 Summed imaging volumes and percentage change in adult imaging volume across patient class in waves 1 and 2

Wave 1	2020 (weeks 63-68)	2019 (weeks 11-16)	% change	Wave 2	2020 (weeks 80-95)	2019 (weeks 28-43)	% change
ED	9521	12783	-25.5	ED	29454	32262	-8.7
IP	9210	9395	-2.0	IP	31424	26576	18.2
OP	8874	12636	-29.8	OP	26967	35236	-23.5
Overall	27605	34814	-20.7	Overall	87845	94074	-6.6

ED: Emergency department; IP: Inpatient; OP: Outpatient.

Table 3 Summed imaging volumes and percentage change in adult imaging volumes across modalities in wave 1

Wave 1	2020 (weeks 63-68)	2019 (weeks 11-16)	%
Angiography	269	300	-10.3
Bone Mineral Densitometry	185	239	-22.6
Computed Tomography	5883	6688	-12.0
Fluoroscopy	766	968	-20.9
General Radiography	11668	15311	-23.8
Magnetic Resonance Imaging	2013	2709	-25.7
Mammography	82	123	-33.3
Nuclear Medicine	394	626	-37.1
Ultrasound	6345	7850	-19.2
Total	27605	34814	-20.7

Table 4 Summed imaging volumes and percentage change in adult imaging volume across modalities in wave 2

Wave 2	2020 (weeks 80-95)	2019 (weeks 28-43)	%
Angiography	822	835	-1.6
Bone mineral densitometry	690	892	-22.6
Computed tomography	19316	18997	1.7
Fluoroscopy	2313	2550	-9.3
General radiography	36845	40592	-9.2
Magnetic resonance imaging	6685	7539	-11.3
Mammography	303	334	-9.3
Nuclear medicine	1149	1679	-31.6
Ultrasound	19722	20656	-4.5
Total	87845	94074	-6.6

Table 5 Comparison of mean adult weekly imaging volumes for 2019 and 2020 including 95%CIs, by imaging modality categorised by patient setting

Adult Setting	Modality	2020			2019			P value
		Mean	Min-max	95%CI	Mean	Min-max	95%CI
Emergency	Angiography	4.05	1-10	3.38-4.71	5.03	2-12	4.51-5.56	0.02
	Computed tomography	541.2	384-663	520-562.4	548.68	473-606	541.7-555.7	0.453
	Fluoroscopy	5.18	1-12	4.31-6.05	4.15	0-11	3.58-4.72	0.042
	Radiography	1162.64	925-1309	1133.02-1192.25	1299.03	1156-1446	1281.05-1317.02	< 0.0001
	Magnetic resonance imaging	12.11	3-27	10.35-13.87	18.55	9-30	17.09-20.01	< 0.0001
	Nuclear Medicine	3.27	0-8	2.66-3.88	7.55	0-21	6.43-8.67	< 0.0001
	Ultrasound	122.98	85-157	117.52-128.43	172.13	116-255	163.72-180.55	< 0.0001
	Mammography	0	0-0	0-0	0.02	-0.02-0.05	0-0.1	0.394
Inpatient	Angiography	38.8	23-53	36.25-41.34	29.48	17-43	27.94-31.02	< 0.0001
	Computed tomography	408.05	277-498	392.38-423.71	298.87	210-416	285.57-312.16	< 0.0001
	Fluoroscopy	125.98	82-162	120.33-131.63	129.25	80-155	125.39-133.11	0.325
	Radiography	855.64	557-1015	824.02-887.25	794.77	685-968	779.87-809.67	0.0003
	Magnetic resonance imaging	123.09	74-158	117.84-128.34	100.65	67-132	97.32-103.98	< 0.0001
	Nuclear Medicine	21.64	8-37	19.76-23.52	20.92	12-35	19.68-22.15	0.507
	Ultrasound	325.82	215-395	314.29-337.35	264.22	192- 323	256.97-271.46	< 0.0001
	Mammography	0.7	0-7	0.3-1.1	1.87	0-10	1.3-2.43	0.002
	Bone mineral densitometry	1.41	0-5	0.97-1.85	1.6	0-5	1.27-1.93	0.479
Outpatient	Angiography	9.0	2-26	7.47-10.53	17.08	5-30	15.86-18.31	< 0.0001
	Computed tomography	249.86	107-333	234.48-265.25	313.7	139-367	302.61-324.79	< 0.0001
	Fluoroscopy	17.61	6-37	15.2-20.03	24.78	5-43	22.97-26.59	< 0.0001
	Radiography	268.02	120-473	246.82-289.23	427.12	147-507	410.57-443.66	< 0.0001
	Magnetic resonance imaging	268.09	98-414	249.76-286.43	347.6	108-401	335.36- 359.84	< 0.0001
	Nuclear medicine	50.84	19-88	46.88-54.8	71.72	31-112	68.14-75.3	< 0.0001
	Ultrasound	768.48	492-943	741.33-795.62	855.27	554-931	836.21-874.32	< 0.0001
	Mammography	15.82	2-24	14.2-17.44	17.75	8-23	16.87-18.63	0.027
	Bone mineral densitometry	36.77	4-72	301.13-42.42	50.9	0-72	47.57-54.23	< 0.0001
All classes	Angiography	51.84	30-70	48.58-55.11	51.6	30-63	49.76-53.44	0.892
	Computed tomography	1199.11	768-1458	1154.65-1243.58	1161.25	962-1339	1141.96-1180.54	0.090
	Fluoroscopy	148.77	96-205	141.2-145.35	158.18	92-184	153.59-162.78	0.027
	Radiography	2286.3	1602-2603	2214.97-2357.62	2520.92	2310-2718	2498.03-2543.80	< 0.0001
	Magnetic resonance imaging	403.30	175-556	380.71-425.88	466.8	200-526	452.6-481.0	< 0.0001
	Nuclear medicine	75.75	29-128	70.65-80.85	100.18	46-134	96.21-104.15	< 0.0001
	Ultrasound	1217.27	808-1491	1178.47-1256.08	1291.62	918-1429	1268.35-1314.88	.001
	Mammography	16.52	2-24	14.87-18.17	19.63	10-30	18.61-20.66	0.001
	Bone mineral densitometry	38.18	5-74	32.33-44.03	52.5	0-72	49.13-55.87	< 0.0001
	Total	5437.05	3520-6441	5250.9-5623.8	5822.68	4645-6175	5750.97- 5894.4	< 0.0001

Table 6 Summed imaging volumes and percentage change in adult mobile imaging volume across patient class in waves 1 and 2

Wave 1	2020 (weeks 63-68)	2019 (weeks 11-16)	% change	Wave 2	2020 (weeks 80-95)	2019 (weeks 28-43)	% change
ED	1952	372	424.7	ED	7526	1037	625.7
IP	2008	2138	-6.1	IP	8654	5845	48.1
Overall	3960	2510	57.8	Overall	16180	6882	135.1

ED: Emergency department; IP: Inpatient.

Table 7 Comparison of mean adult weekly imaging volumes for 2019 and 2020 including 95%CIs, by mobile and non-mobile imaging categorised by patient setting

Adult Setting	Modality	2020			2019			P value
		Mean	Min-max	95%CI	Mean	Min-max	95%CI
Emergency	Mobile	366.64	63- 550	330.11-403.17	63.23	45-85	60.86-65.61	< 0.0001
	Non-mobile	783.59	574-1190	739.11-828.08	1234.33	1095-1385	1216.54-1252.13	< 0.0001
Inpatient	Mobile	451.25	240-614	420.38-482.12	355.65	298-417	348.44-362.86	< 0.0001
	Non-mobile	404.00	310-514	386.64-421.36	438.93	339-564	428.10-449.77	0.001

Table 8 Summed imaging volumes and percentage change in paediatric imaging volume across patient class in waves 1 and 2

Wave 1	2020 (weeks 63-68)	2019 (weeks 11-16)	% change	Wave 2	2020 (weeks 80-95)	2019 (weeks 28-43)	% change
ED	804	1498	-46.3	ED	2780	3887	-28.5
IP	1799	2571	-30.0	IP	5818	6938	-16.1
OP	1162	1207	-3.7	OP	3041	3776	-19.5
Overall	3765	5276	-28.6	Overall	11639	14601	-20.3

ED: Emergency department; IP: Inpatient; OP: Outpatient.

Table 9 Summed imaging volumes and percentage change in paediatric imaging volume across modalities in wave 1

Wave 1	2020 (weeks 63-68)	2019 (weeks 11-16)	%
Angiography	9	6	50
Bone mineral densitometry	16	22	-27.3
Computed tomography	71	96	-26.0
Fluoroscopy	120	148	-18.9
General radiography	1896	2936	-35.4
Magnetic resonance imaging	253	340	-25.6
Nuclear medicine	12	23	-47.8
Ultrasound	1388	1705	-18.6

Table 10 Summed imaging volumes and percentage change in paediatric imaging volume across modalities in wave 2

Wave 2	2020 (weeks 80-95)	2019 (weeks 28-43)	%
Angiography	19	23	-17.4
Bone mineral densitometry	56	68	-17.6
Computed tomography	226	241	-6.2
Fluoroscopy	314	397	-20.9
General radiography	5472	7938	-31.1
Magnetic resonance imaging	874	922	-5.2
Nuclear medicine	38	60	-36.7
Ultrasound	4640	4952	-6.3

Table 11 Comparison of mean paediatric weekly imaging volumes for 2019 and 2020 including 95%CIs, by imaging modality categorised by patient setting

Paediatric Setting	Modality	2020			2019			P value
		Mean	Min-max	95%CI	Mean	Min-max	95%CI
Emergency	Angiography	0.02	0-1	-0.02-0.07	0.02	0-1	-0.02-0.05	-0.83
	Computed tomography	4.3	0-11	3.54-5.05	5.0	0-12	4.33-5.67	0.17
	Fluoroscopy	2.27	0-6	1.68-2.86	2.53	0-7	2.08-2.99	0.48
	Radiography	160.77	75-281	144.44 -177.11	206.58	123-268	198.64-214.52	< 0.0001
	Magnetic resonance imaging	1.7	0-5	1.33-2.08	1.87	0-5	1.49-2.24	0.55
	Nuclear Medicine	0.07	0-1	-0.01-0.15	0.05	0-1	-0.01-0.11	0.70
	Ultrasound	14.41	6-25	13.16-15.65	17.67	8-26	16.59-18.74	0.0001
Inpatient	Angiography	1.18	0-4	0.83-1.53	1.17	0-6	0.85-1.48	0.95
	Computed tomography	5.66	1-14	4.92-6.4	5.66	0-11	5.0-6.27	0.96
	Fluoroscopy	17.8	7-38	15.86-19.73	19.98	7-30	18.61-21.36	0.061
	Radiography	85.84	56-120	81.74-89.94	97.97	70-143	93.99- 101.95	< 0.0001
	Magnetic resonance imaging	25.73	11-41	23.6-27.86	25.05	8-41	23.41-26.69	0.61
	Nuclear Medicine	0.55	0-3	0.28-0.81	0.98	0-5	0.72-1.25	0.025
	Ultrasound	58.36	33-76	55.51-61.21	65.33	40-84	62.9-67.77	0.0003
	Bone mineral densitometry	0.82	0-4	0.47-1.17	1.27	0-4	1.01-1.53	0.038
Outpatient	Angiography	0.05	0-1	-0.02-0.11	0.38	0-3	0.20-0.57	0.003
	Computed tomography	4.43	1-9	3.82-5.04	4.28	0-10	3.75-4.82	0.72
	Fluoroscopy	2.25	0-7	1.7-2.8	2.72	0-9	2.22-3.22	0.22
	Radiography	121.2	66-197	110.62-131.79	167.88	87-215	161.21-174.55	< 0.0001
	Magnetic resonance imaging	25.48	10-37	23.49-27.46	28.82	11-47	26.92-30.72	0.019
	Nuclear medicine	2	0-6	1.54-2.46	2.47	0-6	2.08-2.86	0.13
	Ultrasound	198.77	92-266	186.88-210.66	208.77	117-260	201.54-215.99	0.13
	Bone mineral densitometry	1.86	0-8	1.37-2.35	2.8	0-7	2.35-3.25	0.007
All classes	Angiography	1.25	0-4	0.89-1.61	1.57	0-6	1.22-1.91	0.22
	Computed tomography	14.39	8-23	13.10-15.67	14.92	5-21	14.01-15.83	0.49
	Fluoroscopy	22.32	11-44	20.04-24.60	25.23	8-40	3.59-4.54	0.037
	Radiography	367.82	239-538	340.73-394.90	472.43	331-581	458.91-485.96	< 0.0001
	Magnetic resonance imaging	52.91	23-78	49.27-56.55	55.73	22-84	52.78-58.68	0.23
	Nuclear Medicine	2.61	0-8	2.01-3.21	3.5	0-7	3.05-3.95	0.017
	Ultrasound	271.55	149-346	258.11-284.98	291.77	184-350	283.07-300.46	0.010
	Bone mineral densitometry	2.68	0-9	2.03-3.33	4.07	0-8	3.59-4.54	0.001
	Total	735.52	476-1024	693.13-777.91	869.22	553-1016	845.88-892.55	< 0.0001

Table 12 Summed imaging volumes and percentage change in paediatric mobile imaging volume across patient class in waves 1 and 2

Wave 1	2020 (weeks63-68)	2019 (weeks 11-16)	% change	Wave 2	2020 (weeks 80-95)	2019 (weeks 28-43)	% change
ED	44	32	37.5	ED	370	151	145.0
IP	400	415	-3.6	IP	1021	1340	-23.8
Overall	444	447	-0.7	Overall	1391	1491	-6.7

ED: Emergency department; IP: Inpatient.

Table 13 Comparison of mean paediatric weekly imaging volumes for 2019 and 2020 including 95%CIs, by mobile and non-mobile imaging categorised by patient setting

Paediatric Setting	Modality	2020			2019			P value
		Mean	Min-max	95%CI	Mean	Min-max	95%CI
Emergency	Mobile	18.70	1-38	16.08-21.33	6.62	1-17	5.69-7.54	< 0.0001
	Non-mobile	142.07	63-251	126.62 – 157.52	199.97	121-261	192.12 – 207.81	< 0.0001
Inpatient	Mobile	66.89	44-95	63.13-70.64	72.95	46-102	69.31- 76.59	0.025
	Non-mobile	18.95	7-33	17.22-20.69	25.00	9-42	23.24-26.76	< 0.0001